The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is :

Answer: Option A

Total age of husband, wife and their child at present
= 3 × 27 + 3 × 3
= 90 years
Total age of wife and child at present
= 20 × 2 + 2 × 5
= 50 years
Husband's age
= 90 - 50
= 40 years