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.

The average age of a group of 10 friends is 15 yr. If one friend leave

1.	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.
A.	5 yr
B.	4 yr
C.	6 yr
D.	None of these
Answer» D. None of these

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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.

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