The average age of a husband and his wife 3 years ago was 39 years. The average age of the husband, wife and their child 2 years hence will be 34 years. Find the present age of the child.

12 years 16 years 15 years 18 years

12 years

Sum of present age of husband and wife = 39 × 2 + 2 × 3 = 78 + 6 = 84 Sum of present age of husband , wife and child is = 3 × 34 - 3× 2 = 102 - 6 = 96 Age of  child = 12 years