the average age of a group of 10 friends is 15 yr. if one friend leaves the gr

Question

the average age of a group of 10 friends is 15 yr. if one friend leaves the group, the average becomes 16 yr. find the age of the friend who left the group.

Options:

A . 2 years

B . 4 years

C . 6 years

D . None of the above

Answer: Option C
Explanation :

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