A.  28 (4 / 7) years

B.  31 (5 / 7) years

C.  32 (1 / 7) years

D.  35 (5 / 7) years

1
Correct Answer :
31 (5 / 7) years
Explanation :

=> Grand Parents -> number = 2, Average age = 67

=> Parents -> number = 2, Average age = 35

=> Grandchildren -> number = 3, Average age = 6

=> Average Age of Family = ( 2 x 67 + 2 x 35 + 3 x 6 ) / ( 2 + 2 + 3 )

=> Average Age of Family = ( 134 + 70 + 18 ) / 7 = 31 (5 / 7) years


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