Ques:- P and Q together can do a work in 6 days. If P alone can do it in 15 days. In how many days can Q alone do it?
Recent Answer : Added by Nishara Pathirana On 2023-04-18 07:32:50:
Assume Q can do the work alone in Q days:
work of a day by both P and Q =>
(1/15) + (1/Q ) = 1/6
solving this Q = 10.
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Recent Answer : Added by Admin On 2020-05-17 12:03:35:
( a ) 11
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Ques:- Find the odd man out:
8, 27, 64, 100, 125, 216, 343
A. 343
B. 125
C. 100
D. 27
Recent Answer : Added by aisha On 2022-08-24 17:03:40:
100
Ques:- The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:
Recent Answer : Added by Blessy On 2022-08-14 16:45:57:
3*12=36
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Ques:- A secret can be told only 2 persons in 5 minutes .the same person tells to 2 more persons and so on . How long will take to tell it to 768 persons ?
Recent Answer : Added by Admin On 2020-05-17 12:02:17:
47.5
Ques:- On Monday a banker processed a batch of cheques, on Tuesday she processed three times as many, and on Wednesday she processed 4000 cheques. In the three days, she processed 16000 cheques. How many did she process on Tuesday?
Recent Answer : Added by Davemark Kigen On 2021-09-28 17:28:21:
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Ques:- When x is real what is the least value of (x**2-6*x+5)/(x**2+2*x+1)
Recent Answer : Added by Admin On 2020-05-17 12:01:23:
(x**2 – 6* x + 5) = (x-1)*(x-5)
(x**2 + 2 * x + 1) = (x + 1) * (x+1) = (x+1)**2
For what x is (x-1)*(x-5)/( (x+1)**2) a minimum?
One way to answer this question is by using calculus.
Take the derivative, and set to zero.
Since this is a fraction of polynomials, and a fraction is
zero only if it’s numerator is zero, we need calculate only
the numerator of the derivative and set it to zero.
The numerator of the
Derivative of (x-1)*(x-5)/( (x+1)**2) is
( (x-1) + (x-5) ) ( x+1)**2 – (x-1)(x-5)( 2 (x+1) )
= (2 x – 6) (x+1)**2 – (2) (x-1)(x-5) (x+1)
= 0
Divide through by 2 (x+1)
(x-3)(x+1) – (x-1)(x-5) = 0
(x**2 – 2 x – 3 ) – (x**2 – 6 x + 5) = 0
x**2 – x**2 – 2 x + 6 x – 3 – 5 = 0
4 x – 8 = 0
x = 2
Plugging in x = 2 into the original
(x**2-6*x+5)/(x**2+2*x+1)
gives us (2**2 – 6 * 2 + 5)/(2**2 + 2*2 + 1)
= (4 – 12 + 5) / (4 + 4 + 1) = -3/9 = -1/3
Least value is -1/3
Ques:- A person is staying in the 25th floor of a 30 storied building. While going to the office, he uses the lift upto zeroth floor. But while returning back from office, the person is using the lift upto 18th floor and use the staircase to reach his home. Can you explain a probable reason?
Recent Answer : Added by SARAVANAN E On 2021-06-11 05:14:16:
Because he is very short for his height he can press upto 18th floor button only
Ques:- A certain sum becomes Rs. 20720 in four years and 24080 in six years at simple interest. Find sum and rate of interest?
Ques:- ‘Day’ is related to ‘Night’ in the same way as ‘White’ is related to
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Day = Night
White = Black
Ques:- A software engineer has the capability of thinking 100 lines of code in five minutes and can type 100 lines of code in 10 minutes. He takes a break for five minutes after every ten minutes. How many lines of codes will he complete typing after an hour?
Recent Answer : Added by Vishal Panjabrao Kokare On 2022-05-17 08:54:15:
15 min 100 line
30 min 200 lines + 15 min rest total 45 min +5 min think +5 min write + 5 min rest
250 line code will be done
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Assume Q can do the work alone in Q days:
work of a day by both P and Q =>
(1/15) + (1/Q ) = 1/6
solving this Q = 10.