Question

A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 68 years, that of the parents is 36 years and that of the grandchildren is 8 years. The average age of the family is:

• A. 33(1/7)
• B. 31(5/7)
• C. 34(3/7)
• D. 36(3/7)
• E. 34(2/7)

Answer 1

The correct option is A

33(1/7)

Avg. age of the family=$\frac{68\ast 2+36\ast 2+8\ast 3}{7}=33\frac{1}{7}$