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A family consists of grandparents, pa...

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? `28 4/7` years (b) `31 5/7` years (c) `32 1/7` years (d) None of these

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