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?  Choose the correct choice from the following choices.
A) 31 5/8 years	B) 31 5/7 years	C) 31 9/7 years	D) 38 5/7 years	E) 31 5/4 years
Required Average = [(67 * 2) + (35 * 2 ) + (6 * 3)]/(2 + 2 + 3)   = (134 + 70 + 18)/7   = 31 5/7 years.   Answer:31 5/7 years
<result>B</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?