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 ?
Pick one.
A) 31( 5/7) B) 81( 5/7) C) 51( 5/7) D) 41( 5/7) E) 31( 3/7)
Explanation:   Required average = (67 * 2 + 35 * 2 + 6 * 3) / (2 + 2 + 3)   = (134 + 70 + 18) / 7 = 222 / 7 = 31(5/7) years.   31( 5/7)nswer: 31( 5/7)
<result>A</result>
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 ?