A family consists of g

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 xx 2 + 35 xx 2 +6 xx 3)/(2 + 2 + 3))`

= `((134 + 70 + 19)/(7))` = `222/7` = `31 5/7`

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