A family consists of grandparents, parents and three grandchildren. The average

Question

A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?

Options:

A . 28 4/7 years

B . 31 5/7 years

C . 32 1/7 years

D . None of these

Answer: Option B

Required Average = [(67 * 2) + (35 * 2 ) + (6 * 3)]/(2 + 2 + 3)= (134 + 70 + 18)/7 = 31 5/7 years.

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