Answering Exams

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 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. 28 4/7 years
B. 31 5/7 years (Correct)
C. 32 1/7 years
D. None of these

Explanation:

Required Average = [(67 * 2) + (35 * 2 ) + (6 * 3)]/(2 + 2 + 3)

= (134 + 70 + 18)/7 = 31 5/7 years.

 

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