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. 35(4/9)
B. 31( 5/7)
C. 34(4/7)
D. 32 (6/7)
Answer:B
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. 35(4/9) B. 31( 5/7) C. 34(4/7) D. 32 (6/7)