A family consists of two grandparents, two parents and four grandchildren. The average age of the grandparents is 70 years, that of the parents is 40 years and that of the grandchildren is 6 years. What is the average age of family?	Select.
A) 8/4years  B) B)31  C) C)30  D) D)33  E) E)35
Required average   = (70 x 2 + 40 x 2 + 6 x 4 )/(2 + 2 + 4)   = (140 + 80 + 24)/8   = 244/8   = 30 8/4years.   8/4yearsnswer is 8/4years
<result>A</result>
A family consists of two grandparents, two parents and four grandchildren. The average age of the grandparents is 70 years, that of the parents is 40 years and that of the grandchildren is 6 years. What is the average age of family?