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?
A. 31 5/7 years
B. None of these
C. 28 4/7 years
D. 32 1/7 years
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