Three years ago, the average age of a husband, wife and child was 26 years, and that of the wife and the child, 5 years ago, was 20 years. The present age of the husband is:

37 years

Sum of present age of husband , wife and child = 3 × 26 + 3 × 3

= 87 years

Sum of present age of wife &  child is = 2 × 20 + 2 × 5 = 50 years

Present age of Husband = 87 - 50 = 37 years