A has three daughters whose ages are in the ratio 7 ∶ 8 ∶ 9 (at present). Their husbands are 3, 2 and 6 years respectively elder to their wives. Each one of the couple has a child whose age is 1/5th the sum of ages of their parents. If sum of age of the grandchildren of A is 31, then what is the sum of ages of the son-in-laws of A? (in years) All the ages are measured at present.

A has three daughters whose ages are in the ratio 7 ∶ 8 ∶ 9 (at pr

1.	A has three daughters whose ages are in the ratio 7 ∶ 8 ∶ 9 (at present). Their husbands are 3, 2 and 6 years respectively elder to their wives. Each one of the couple has a child whose age is 1/5th the sum of ages of their parents. If sum of age of the grandchildren of A is 31, then what is the sum of ages of the son-in-laws of A? (in years) All the ages are measured at present.
A.	80
B.	81
C.	82
D.	83
E.	84
Answer» E. 84