The average age of husband, wife and their child 4 years

Solution

4 years ago, sum of ages of husband, wife and child = 26 x 3 = 78 years Present sum of ages of husband, wife and child = 78 + (4 x 3) = 78 + 12 = 90 years 5 years ago, Sum of the ages of wife and child = 2 × 25 = 50 years Present Sum of the ages of wife and child = 50 + (5 × 2) = 50 + 10 = 60 years Now, Husband's present age = Present sum of ages of husband, wife and child - Present Sum of the ages of wife and child Husband’s present age ⇒ (90 - 60) = 30 years