Question

The average age of 3 families is 27. The number of members in each of the family is 3 and the average age of family 1 is 22, the average age of family 2 is 30. Find the average age of family 3.

• A. 28
• B. 29
• C. 27
• D. 30

Answer 1

The correct option is B

29

Let the average age of family 3 is y.

Given that, the average age of 3 families collectively is 27 and the average age of family 1 is 22, the average age of family 2 is 30.

$⟹$ $\frac{22+30+y}{3}$ = 27.

$⟹$ 52 + y = 81

$⟹$ y = 29

So, the average age of family 3 is 29.