A family consists of grandparents, parents and three grand children. The average age of the grandparents is 67 years, that of the parents is 38 years and that of the grandchildren is 6 years. What is the average age of the family? Select the correct option:
A) 28 4â„7 years B) 31 5â„7 years C) 32 4â„7 years D) 27 1â„2 years E) None of these
Required average = (67Ã—2+38Ã—2+6Ã—3/2+2+3)   =228/7   = 32 4â„7 years   Answer 32 4â„7 years
<result>C</result>
A family consists of grandparents, parents and three grand children. The average age of the grandparents is 67 years, that of the parents is 38 years and that of the grandchildren is 6 years. What is the average age of the family?