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Ques:- The average age of 12 students is 20 years. If the age of one more student is included, the average decreases by 1. What is the age of the new student?
A. 5 years
B. 6 years
C. 7 years
D. 9 years
Recent Answer : Added by DK On 2022-03-09 16:28:54:
Correct option is C)
Let be students are consider as child
Let the age of child added later be x years.
average age of 12 children =20 years
∴ Total age of 12 children =20×12=240 years
After one more child is added-
Average of 13 children =20−1=19 years
Average age of 13 children =
13
sum of 12 children+x
19=
13
240+x
⇒240+x=247
⇒x=247−240=7 years
Hence the age of child added later is 7 years.
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Recent Answer : Added by venkatesh On 2021-08-12 06:28:25:
Balls- B1, B2, B3, B4, B5, B6, B7, B8, B9.
Group1 – (B1, B2, B3), Group2 – (B4, B5, B6), Group3 – (B7, B8, B9)
Now weigh any two groups. Group1 on left side of the scale and Group2 on the right side.
When weighing scale tilts left – Group1 has a heavy ball or right – Group2 has a heavy ball or balanced – Group3 has a heavy ball.
Lets assume Group 1 has a heavy ball.
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When weighing scale tilts left – B1 is the heavy or tilts right – B2 is the heavy or balanced – B3 is the heavy.
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Recent Answer : Added by DSK On 2021-08-09 17:01:34:
1)Port
2)Trop
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Recent Answer : Added by Shraddha On 2020-07-29 09:50:35:
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A. 14th
B. 7th
C. 11th
D. 18th
Recent Answer : Added by SHIVANI VISHNU PATIL On 2021-07-28 15:08:27:
A. 14th
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24 days
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Recent Answer : Added by kavin On 2021-07-17 10:05:48:
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A. 10,999
B. 109,999
C. 11,110
D. 111,110
Recent Answer : Added by Mohana On 2022-09-23 18:10:41:
Greatest number of 5 digits=99, 999
Smallest number of 5 digits=10, 000
And their sum=99, 999+10, 000=109, 999
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A. Japan
B. Italy
C. USA
D. France
Recent Answer : Added by Hariharan On 2022-08-14 16:33:48:
France — D
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1.26
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Correct option is C)
Let be students are consider as child
Let the age of child added later be x years.
average age of 12 children =20 years
∴ Total age of 12 children =20×12=240 years
After one more child is added-
Average of 13 children =20−1=19 years
Average age of 13 children =
13
sum of 12 children+x
19=
13
240+x
⇒240+x=247
⇒x=247−240=7 years
Hence the age of child added later is 7 years.