a family consists of grandparents, parents and three grandchildren. the averag

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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

Options:

A . 28 4/7 years

B . 31 5/7 years

C . 32 1/7 years

D . None of these

Answer: Option B
Explanation :

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