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

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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 the average age of the family?

Options:

A . $$28\frac{4}{7}{\text{ years}}$$

B . $$31\frac{5}{7}{\text{ years}}$$

C . $$32\frac{1}{7}{\text{ years}}$$

D . None of these

Answer: Option B

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