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The average age of a group of persons go...

The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is

A

a) 5

B

b) 10

C

c) 20

D

d) 30

Text Solution

Verified by Experts

The correct Answer is:
C
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DISHA PUBLICATION-AVERAGES-Practice Exercises (Foundation Level)
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  9. Read the information given below and answer the questions that follow ...

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  12. Eight years ago there were 5 members in the Arthur's family and then t...

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  13. Eight years ago there were 5 members in the Arthur's family and then t...

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  14. Eight years ago there were 5 members in the Arthur's family and then t...

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  15. The average age of a committee of 11 persons increases by 2 yr when 3 ...

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  16. A school has only four classes that contain 10,20,30 and 40 students r...

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  17. Find the average of f(x), g(x), h(x), d(x) at x=10. f(x) is equal to x...

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