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Serum Institute Of India Recruitment Process, Interview Questions & Answers

Serum Institute Of India’s selection process typically incorporates a written test on biotechnology concepts, technical interviews with domain experts, and HR discussions to gauge cultural fit and communication abilities.
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About Serum Institute Of India

Company Description

Serum Institute of India (SII) is the world's largest vaccine manufacturer by the number of doses produced and sold globally. Established in 1966, the company is dedicated to producing high-quality vaccines at an affordable price, contributing to global health initiatives. Its work culture is characterized by innovation, collaboration, and a commitment to excellence. Employees are encouraged to contribute to research and development, fostering a sense of ownership in their projects. The job environment at SII promotes continuous learning and professional growth, with opportunities for employees to engage in groundbreaking research and work alongside leading experts in the pharmaceutical industry.

Quality Control Analyst Interview Questions

Q1: What are the key responsibilities of a Quality Control Analyst?

The key responsibilities include performing tests on raw materials, in-process materials, and finished products to ensure they meet quality standards, documenting results, and collaborating with other departments to address quality issues.

Q2: Can you explain the difference between quality assurance and quality control?

Quality assurance focuses on the process of ensuring quality is built into the production process, while quality control involves the actual testing and inspection of products to ensure they meet specified standards.

Q3: How do you handle non-conformance in quality testing?

I follow a structured approach by documenting the issue, investigating the root cause, implementing corrective actions, and conducting follow-up tests to ensure the issue has been resolved.

Q4: What quality control techniques are you familiar with?

I am familiar with techniques such as Statistical Process Control (SPC), Six Sigma, and Good Manufacturing Practices (GMP), among others.

Q5: How do you stay updated with regulatory requirements in the pharmaceutical industry?

I regularly review guidelines from relevant regulatory bodies, attend industry conferences, and participate in training sessions to ensure compliance with current standards.

Research Scientist Interview Questions

Q1: What is your experience with vaccine development?

I have worked on several projects involving the development of vaccine candidates, including conducting preclinical studies and collaborating with cross-functional teams to design and execute experiments.

Q2: Can you describe a successful research project you led?

I led a project focused on developing a vaccine for a viral infection, where I designed the experimental framework, conducted trials, and analyzed data that ultimately contributed to successful preclinical results.

Q3: How do you prioritize your research tasks?

I prioritize tasks based on project timelines, the impact of the research on overall goals, and resource availability, ensuring that critical objectives are met efficiently.

Q4: What methodologies do you use in your research?

I utilize various methodologies, including molecular biology techniques, immunological assays, and animal models, to assess vaccine efficacy and safety.

Q5: How do you handle setbacks in research?

I analyze the situation to understand the cause of the setback, adjust the research plan accordingly, and maintain open communication with my team to ensure we stay aligned on our objectives.

Production Supervisor Interview Questions

Q1: What experience do you have in managing production processes?

I have over five years of experience overseeing production lines, ensuring that operations run smoothly, and that products are manufactured to meet quality and safety standards.

Q2: How do you ensure compliance with safety regulations in the production environment?

I conduct regular safety audits, provide training for employees, and enforce safety protocols to create an environment that prioritizes workplace safety.

Q3: Can you describe a time when you improved production efficiency?

I implemented a new scheduling system that reduced downtime between shifts, resulting in a 15% increase in overall production efficiency without compromising quality.

Q4: What strategies do you use to manage a diverse team?

I promote open communication, encourage collaboration, and recognize individual strengths, creating an inclusive environment that values contributions from all team members.

Q5: How do you handle conflicts among team members?

I address conflicts promptly by facilitating discussions to understand different perspectives, guiding the team toward a resolution that aligns with our shared goals.

Regulatory Affairs Specialist Interview Questions

Q1: What are the main responsibilities of a Regulatory Affairs Specialist?

The main responsibilities include preparing and submitting regulatory documents, ensuring compliance with local and international regulations, and communicating with regulatory agencies.

Q2: How do you stay informed about changes in regulatory guidelines?

I subscribe to regulatory newsletters, participate in professional organizations, and attend workshops to keep abreast of changes in regulations and guidance.

Q3: Can you explain the process of submitting a new drug application (NDA)?

The NDA process involves compiling comprehensive data on the drug's safety and efficacy, preparing the application according to regulatory guidelines, and submitting it to the appropriate regulatory body for review.

Q4: What challenges have you faced in regulatory submissions, and how did you overcome them?

I faced challenges related to incomplete data submissions. I overcame these by implementing a checklist system to ensure all necessary documents were included before submission.

Q5: What role do you think a Regulatory Affairs Specialist plays in a pharmaceutical company?

A Regulatory Affairs Specialist acts as a bridge between the company and regulatory agencies, ensuring that products meet legal requirements while facilitating timely market access.

Conclusion Interview Questions

These interview questions and answers are tailored to common job roles at Serum Institute of India, reflecting the skills and expertise needed for various positions within the company.

Serum Institute Of India Interview Guide

Company Background and Industry Position

The Serum Institute of India (SII) is not just another pharmaceutical company; it’s a global powerhouse in vaccine manufacturing. Headquartered in Pune, Maharashtra, this privately held entity has earned a reputation that echoes well beyond Indian borders. Founded in 1966 by Dr. Cyrus Poonawalla, SII’s journey has been one of relentless innovation, strategic partnerships, and a mission-oriented approach to public health.

Today, SII stands as the world’s largest vaccine producer by volume, a title that reflects both its scale and significant role in global immunization programs. Its vaccines reach over 170 countries, making it an indispensable player in combatting diseases like polio, measles, influenza, and more recently, COVID-19.

What sets Serum Institute apart in the biopharmaceutical landscape is not just its production capacity but its strategic focus on affordability and accessibility. This mission-driven approach influences its recruitment philosophy, emphasizing candidates who are not only technically sound but also align with the company’s core values of social responsibility.

How the Hiring Process Works

  1. Application Screening: The journey begins with a thorough review of resumes and applications submitted through the company’s career portal or recruitment drives. Here, recruiters look for clear alignment with the job role, relevant industry experience, and educational qualifications.
  2. Aptitude/Technical Assessment: For most technical positions, candidates face an online or offline assessment that tests their domain knowledge and problem-solving abilities. This is more than a formality; it helps filter applicants who meet the rigorous standards Serum Institute upholds.
  3. Technical Interview: Shortlisted candidates are invited for technical interviews, usually conducted by panel members from the relevant departments. This phase assesses not only theoretical knowledge but practical application and innovation mindset.
  4. HR Interview: The final step often involves an HR round focusing on cultural fit, communication skills, and motivation. This stage is equally pivotal as SII emphasizes team dynamics and commitment alongside hard skills.
  5. Offer and Onboarding: Successful candidates receive an offer, followed by formalities related to documentation and induction programs to integrate newcomers smoothly into the organization.

This sequential process, while standard, carries nuances specific to Serum Institute’s culture and industry demands. The company values thoroughness because what’s at stake is public health, after all.

Interview Stages Explained

Application Screening: The First Filter

This step is deceptively simple but profoundly important. Recruiters sift through hundreds, sometimes thousands, of profiles. What they zone in on is not just academic credentials but evidence of relevant experience, internships, or projects that resonate with the role at hand.

For instance, a candidate applying for a role in vaccine research would benefit from highlighting laboratory skills, publications, or specific coursework. The absence of such signals can be a fast track to rejection, even before interviews begin.

Technical Assessment: Demonstrating Skill Under Pressure

Expect technical tests that aren’t just about rote memorization. The questions often gauge your analytical thinking and how you approach complex problems. Candidates sometimes find these assessments tough because there's an emphasis on practical knowledge—how would you handle real-world challenges in vaccine development or quality control?

It’s also worth noting that these assessments differ by function. For R&D roles, expect problem-solving around biochemistry or microbiology. For manufacturing roles, questions may lean toward process optimization or regulatory compliance.

Technical Interview: Depth Over Breadth

The technical interview is where the rubber meets the road. Interviewers want to see not just that you know your stuff, but that you can apply it creatively and responsibly. Here, the focus often shifts to scenario-based questions—'How would you troubleshoot a batch contamination issue?' is a common one.

Candidates frequently share that this round tests both their domain expertise and their ability to communicate complex ideas clearly—a critical skill in a company where cross-functional teamwork is the norm.

HR Interview: Assessing Cultural Compatibility

While technical capabilities get you in the door, the HR round determines if you fit the team's ethos. You might be asked about your motivation for joining SII, your long-term career goals, or how you handle pressure and ethical dilemmas. The HR panel seeks honesty, humility, and a demonstrated passion for healthcare.

Many candidates recall this stage as conversational but also revealing; it’s where the human side of hiring comes through, reminding us that a vaccine company needs empathetic and driven employees, not robots.

Examples of Questions Candidates Report

  • Technical Interview: "Explain the process of vaccine development from lab scale to mass production."
  • Technical Interview: "How would you ensure quality control in a vaccine manufacturing plant?"
  • Technical Interview: "Describe a challenging research project and how you overcame obstacles."
  • HR Interview: "Why do you want to work at Serum Institute of India, specifically?"
  • HR Interview: "Tell us about a time you had to work under pressure and how you managed it."
  • Aptitude/Technical Test: Domain-specific multiple-choice questions or case studies involving biochemistry, microbiology, or process engineering.

Eligibility Expectations

Serum Institute maintains clear eligibility criteria that vary across job roles but emphasize strong educational backgrounds in life sciences, biotechnology, microbiology, pharmaceutical sciences, or related engineering disciplines. Advanced degrees such as M.Tech, M.Pharm, or Ph.D. are often preferred for R&D positions.

For entry-level roles, a bachelor’s degree coupled with relevant internships or project experience can be sufficient. However, candidates must demonstrate a solid understanding of basic scientific principles and a keen interest in vaccine technology.

In addition to academic qualifications, the company values candidates with exposure to Good Manufacturing Practices (GMP), cGMP compliance, or regulatory frameworks like WHO and CDSCO guidelines, especially for roles tied to production and quality assurance.

Common Job Roles and Departments

Serum Institute’s hiring spans a diverse set of roles, reflecting the complex ecosystem of vaccine development and manufacturing:

  • Research & Development: Scientists, research analysts, clinical trial coordinators who drive innovation and product pipeline development.
  • Production and Manufacturing: Process engineers, production supervisors, quality assurance specialists handling large-scale vaccine production.
  • Quality Control and Regulatory Affairs: Analysts ensuring compliance with international standards and navigating regulatory approvals.
  • Supply Chain and Logistics: Professionals managing raw materials, distribution channels, and inventory management critical for timely delivery.
  • Corporate Functions: HR, finance, legal, and marketing teams supporting organizational growth and global partnerships.

Each department has unique hiring nuances, but the underlying thread is a demand for technical competence blended with a mission-driven mindset.

Compensation and Salary Perspective

RoleEstimated Salary (INR/Year)
Research Scientist6,00,000 - 12,00,000
Production Engineer4,00,000 - 8,00,000
Quality Control Analyst3,50,000 - 7,00,000
Regulatory Affairs Specialist5,00,000 - 10,00,000
Supply Chain Manager6,00,000 - 11,00,000
HR Executive4,00,000 - 7,00,000

While these figures are approximate and subject to variation by experience and negotiation, they tend to be competitive within the Indian biotech sector. Compared to global pharma giants, SII offers moderate packages but balances this with robust job security and meaningful work impact.

Interview Difficulty Analysis

Serum Institute’s interviews are widely regarded as moderately challenging, reflecting their blend of technical rigor and cultural assessment. Candidates with solid academic foundations and practical experience generally navigate the process smoothly, but surprises often arise in the form of application-based questions requiring lateral thinking.

What makes it tricky? The sheer breadth of knowledge expected. You can’t just be a textbook scientist; you need to demonstrate an understanding of manufacturing realities, regulatory landscapes, and even supply chain intricacies. This multidimensionality tests versatility in a way that pure academic interviews do not.

Additionally, the pressure of knowing that your work impacts global health adds an intangible weight. Candidates often remark that the HR rounds feel intense not because of stress questions but due to the genuine desire to find the right cultural and motivational fit.

Preparation Strategy That Works

  • Understand the Vaccine Industry: Dive deep into the biotech landscape, focusing on vaccine development cycles, key challenges, and global regulatory standards. This context helps you answer questions with relevance.
  • Brush Up on Core Concepts: For technical rounds, revisit your fundamentals in microbiology, immunology, and pharmaceutical manufacturing. Use standard textbooks but also recent research papers to stay current.
  • Practice Problem-Solving: Work on case studies or scenario questions that simulate real-world challenges in vaccine production or quality assurance.
  • Mock Interviews: Simulate technical and HR interviews with peers or mentors who understand the industry. This builds confidence and helps identify gaps in your answers.
  • Prepare Your Story: Reflect on your experiences, challenges, and achievements. Be ready to link these narratives to Serum Institute’s mission and values.
  • Stay Informed About SII: Follow company news, recent vaccine launches, partnerships, and social impact initiatives. Demonstrating this knowledge signals genuine interest.

Work Environment and Culture Insights

From conversations with ex-employees and insiders, Serum Institute fosters an environment that’s both fast-paced and deeply purposeful. Employees often describe the culture as collaborative but demanding, with a palpable sense of urgency given the critical nature of the products.

Unlike purely profit-driven firms, SII’s leadership emphasizes ethical responsibility and social impact, which resonates through team interactions. Candidates entering this space should be prepared for high expectations—not just in output but in integrity and accountability.

Some report that decision-making can be hierarchical, which is typical for large manufacturing firms but also reflects the necessity for stringent control in vaccine production. On the bright side, this also means clear processes and a strong commitment to quality.

Career Growth and Learning Opportunities

Serum Institute offers fertile ground for professional development, especially for those passionate about life sciences and public health. The company invests in continuous training, encouraging employees to upgrade skills through workshops, certifications, and sometimes advanced degrees.

Growth trajectories tend to be role-dependent but generally follow a path from technical expert to team lead and beyond, with occasional opportunities to move horizontally into related domains like regulatory affairs or supply chain management.

Importantly, working here exposes employees to global standards and collaborations with international agencies like WHO and GAVI. This exposure itself is a massive boost to one’s career portfolio.

Real Candidate Experience Patterns

What do candidates really go through? Reports vary, but a consistent theme is the emphasis on authenticity and preparedness. Many share stories about the initial shock of detailed technical questioning, followed by a surprisingly warm HR conversation that seems to validate their personal motivations.

A few mention the waiting periods between rounds can be nerve-wracking, reflecting the thoroughness of the selection process. Some felt the technical interviews tested not just knowledge but attitude—whether the candidate showed curiosity and resilience.

There are also tales of group interviews or panel discussions where candidates had to defend their viewpoints—an experience some found intimidating but ultimately rewarding.

Comparison With Other Employers

When stacked against other biotech and pharmaceutical employers in India, Serum Institute strikes a unique balance. Its mission-driven approach contrasts with the more profit-centric models of multinational corporations, making it attractive to candidates motivated by social impact.

However, that commitment comes with expectations around adaptability and work ethic that can outpace some peers. While companies like Cipla or Dr. Reddy’s may offer broader drug portfolios and perhaps higher salaries, SII’s focus on vaccines—and specifically mass immunization—carves out a niche appeal.

Internationally, the culture might feel more conservative than Silicon Valley biotech startups but is arguably more stable and ethically anchored than newer entrants trying to disrupt the market.

Expert Advice for Applicants

The first piece of advice is to genuinely align your preparation with Serum Institute’s core values. This isn’t just about technical prowess but about communicating your commitment to health equity and public service.

Don’t underestimate the importance of clarity in communication. Being able to explain complex scientific ideas simply can set you apart during interviews.

Also, pay attention to the job description’s nuances. Tailor your resume and answers to reflect the specific requirements and challenges of that role within the vaccine ecosystem.

Finally, approach the process with patience and resilience. The thoroughness of the hiring stages reflects the company’s seriousness about quality—if you’re selected, it’s a sign you’re trusted with something deeply important.

Frequently Asked Questions

What type of technical interview questions can I expect for research roles at Serum Institute?

Expect questions related to vaccine development processes, biochemistry, microbiology, and sometimes statistical analysis of clinical trials. Interviewers often focus on your practical experience handling lab work and problem-solving abilities.

How long does the entire recruitment process usually take?

Typically, it spans 3 to 6 weeks from application to final offer depending on the role and recruitment volume. There can be longer waiting periods between rounds, so patience is key.

Is prior industry experience mandatory to apply?

Not always. Fresh graduates with strong academic records and internships in relevant fields can apply, especially for entry-level roles. However, experience is preferred for mid and senior-level positions.

How important is cultural fit during the HR interview?

Extremely important. Serum Institute values candidates who show ethical commitment, teamwork, and an alignment with their mission to provide affordable vaccines globally.

Are there opportunities for international postings or collaborations?

Yes, given SII’s global footprint and partnerships with organizations like WHO, employees sometimes engage in international projects or training, although most roles are based in India.

Final Perspective

Landing a job at Serum Institute of India is more than a career move; it’s joining a mission to safeguard lives worldwide. The interview process reflects the company’s seriousness—challenging yet fair, technical yet human, rigorous yet rooted in empathy.

For candidates who prepare with both knowledge and heart, who see themselves not just as employees but as contributors to a greater cause, Serum Institute offers a unique and rewarding professional journey. Remember, it’s a place where what you do resonates far beyond office walls, touching millions through science and dedication.

Serum Institute Of India Interview Questions and Answers

Updated 21 Feb 2026

Supply Chain Manager Interview Experience

Candidate: Neha Sharma

Experience Level: Senior

Applied Via: Recruitment agency

Difficulty: Hard

Final Result: Rejected

Interview Process

4

Questions Asked

  • How do you optimize supply chain processes?
  • Describe your experience with vendor management.
  • Explain how you handle supply chain disruptions.
  • What KPIs do you track?

Advice

Prepare detailed examples of supply chain improvements and crisis management.

Full Experience

The recruitment agency helped me get an interview. The process was extensive with multiple rounds including case studies and behavioral questions. Although I had relevant experience, I felt some answers could have been stronger regarding crisis handling.

Regulatory Affairs Specialist Interview Experience

Candidate: Suresh Patel

Experience Level: Mid-level

Applied Via: LinkedIn application

Difficulty:

Final Result:

Interview Process

3

Questions Asked

  • What regulatory guidelines are you familiar with?
  • How do you stay updated with regulatory changes?
  • Describe a time you handled a regulatory submission.

Advice

Showcase your knowledge of regulatory frameworks and attention to detail.

Full Experience

I applied via LinkedIn and was contacted for an initial HR call. The technical round focused on my regulatory knowledge and experience with submissions. The final round was with the department head who asked scenario-based questions.

Production Supervisor Interview Experience

Candidate: Priya Kapoor

Experience Level: Senior

Applied Via: Campus recruitment

Difficulty: Hard

Final Result:

Interview Process

4

Questions Asked

  • Describe your experience managing production teams.
  • How do you handle production delays?
  • Explain GMP compliance in production.
  • Give an example of conflict resolution in your team.

Advice

Prepare to discuss leadership experiences and regulatory compliance in detail.

Full Experience

The interview process was rigorous with multiple rounds including HR, technical, and managerial interviews. They emphasized leadership skills and knowledge of Good Manufacturing Practices. I was also asked situational questions to assess my problem-solving abilities.

Quality Control Analyst Interview Experience

Candidate: Rahul Singh

Experience Level: Entry-level

Applied Via: Referral

Difficulty: Easy

Final Result: Rejected

Interview Process

2

Questions Asked

  • What are the key quality parameters in pharmaceutical manufacturing?
  • How do you ensure compliance with SOPs?

Advice

Gain more hands-on experience with quality control instruments and SOP adherence.

Full Experience

I was referred by a friend and attended two rounds of interviews. The first was HR and the second technical. The technical questions were basic but I struggled to explain my practical experience, which cost me the job.

Research Scientist Interview Experience

Candidate: Anjali Mehta

Experience Level: Mid-level

Applied Via: Online application through company website

Difficulty:

Final Result:

Interview Process

3

Questions Asked

  • Explain your experience with vaccine development.
  • How do you handle data analysis in research?
  • Describe a challenging project and how you managed it.

Advice

Be well-prepared to discuss your research projects and demonstrate problem-solving skills.

Full Experience

I applied online and was shortlisted for a research scientist role. The first round was an HR screening, followed by a technical interview focusing on my research experience. The final round involved a presentation on a past project. The interviewers were professional and interested in my practical knowledge.

View all interview questions

Frequently Asked Questions in Serum Institute Of India

Have a question about the hiring process, company policies, or work environment? Ask the community or browse existing questions here.

Common Interview Questions in Serum Institute Of India

Q: A man has a wolf, a goat, and a cabbage. He must cross a river with the two animals and the cabbage. There is a small rowing-boat, in which he can take only one thing with him at a time. If, however, the wolf and the goat are left alone, the wolf will eat the goat. If the goat and the cabbage are left alone, the goat will eat the cabbage. How can the man get across the river with the two animals and the cabbage?

Q: A hare and a tortoise have a race along a circle of 100 yards diameter. The tortoise goes in one directionand the hare in the other. The hare starts after the tortoise has covered 1/5 of its distance and that too leisurely.The hare and tortoise meet when the hare has covered only 1/8 of the distance. By what factor should the hareincrease its speed so as to tie the race?

Q: A rich merchant had collected many gold coins. He did not want anybody to know about them. One day his wife asked, "How many gold coins do we have?" After pausing a moment, he replied, "Well! If I divide the coins into two unequal numbers, then 32 times the difference between the two numbers equals the difference between the squares of the two numbers."The wife looked puzzled. Can you help the merchant's wife by finding out how many gold coins they have?

Q: 9 cards are there. You have to arrange them in a 3*3 matrix. Cards are of 4 colors. They are red, yellow, blue and green. Conditions for arrangement: one red card must be in first row or second row. 2 green cards should be in 3rd column. Yellow cards must be in the 3 corners only. Two blue cards must be in the 2nd row. At least one green card in each row.

Q: 3 policemen and 3 thieves had to cross a river using a small boat. Only two can use the boat for a trip. All the 3 policemen and only 1 thief knew to ride the boat. If 2 thieves and 1 policeman were left behind they would kill him. But none of them escaped from the policemen. How would they be able to cross the river?

Q: 36 people {a1, a2, ..., a36} meet and shake hands in a circular fashion. In other words, there are totally 36 handshakes involving the pairs, {a1, a2}, {a2, a3}, ..., {a35, a36}, {a36, a1}. Then size of the smallest set of people such that the res...

Q: T, U, V are 3 friends digging groups in fields. If T & U can complete i groove in 4 days &, U & V can complete 1 groove in 3 days & V & T can complete in 2 days. Find how many days each takes to complete 1 groove individually.

Q: The citizens of planet nigiet are 8 fingered and have thus developed their decimal system in base 8. A certain street in nigiet contains 1000 (in base 8) buildings numbered 1 to 1000. How many 3s are used in numbering these buildings?

Q: There are 3 sticks placed at right angles to each other and a sphere is placed between the sticks . Now another sphere is placed in the gap between the sticks and Larger sphere . Find the radius of smaller sphere in terms of radius of larger sphere.

Q: ABCDE are sisters. Each of them gives 4 gifts and each receives 4 gifts No two sisters give the same combination ( e.g. if A gives 4 gifts to B then no other sisters can give four to other one.) (i) B gives four to A.(ii) C gives 3 to E. How much did A,B,C,E give to D?

Q: At 6?o a clock ticks 6 times.The time between first and last ticks is 30 seconds.How long does it tick at 12?o clock?2.A hotel has 10 storey. Which floor is above the floor below the floor, below the floor above the floor, below the floor above the fifth.

Q: The egg vendor calls on his first customer and sells half his eggs and half an egg. To the second customer, he sells half of what he had left and half an egg and to the third customer he sells half of what he had then left and half an egg. By the way he did not break any eggs. In the end three eggs were remaining . How many total eggs he was having ?

Q: Every day a cyclist meets a train at a particular crossing .The road is straight before the crossing and both are travelling in the same direction.Cyclist travels with a speed of 10 kmph.One day the cyclist come late by 25 minutes and meets the train 5 km before the crossing.What is the speed of the train?

Q: A long, long time ago, two Egyptian camel drivers were fighting for the hand of the daughter of the sheik of Abbudzjabbu. The sheik, who liked neither of these men to become the future husband of his daughter, came up with a clever plan: a race would dete

Q: There are 7 letters A,B,C,D,E,F,GAll are assigned some numbers from 1,2 to 7.B is in the middle if arranged as per the numbers.A is greater than G same as F is less than C.G comes earlier than E.Which is the fourth letter

Q: Raj has a jewel chest containing Rings, Pins and Ear-rings. The chest contains 26 pieces. Raj has 2 and 1/2 times as many rings as pins, and the number of pairs of earrings is 4 less than the number of rings. How many earrings does Raj have?...

Q: An escalator is descending at constant speed. A walks down and takes 50 steps to reach the bottom. B runs down and takes 90 steps in the same time as A takes 10 steps. How many steps are visible when the escalator is not operating. 

Q: A family X went for a vacation. Unfortunately it rained for 13 days when they were there. But whenever it rained in the mornings, they had clear afternoons and vice versa. In all they enjoyed 11 mornings and 12 afternoons. How many days did they stay there totally?

Q: Joe started from Bombay towards Pune and her friend julie in opposite direction. they met at a point . distance traveled by joe was 1.8 miles more than that of julie.after spending some both started there way. joe reaches in 2 hours while julie in 3.5 hours.Assuming both were traveling with constant speed. What is the distance between the two cities.

Q: Four persons have to cross the bridge they are having one torch light. Four persons take 1,2,5,10 minutes respectively, when two persons are going they will take the time of the slowest person. What is the time taken to cross by all of them.

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