Let the present age of father = x year and Son’s present age = y years. 5 years ago, father’s age = x – 5 and Son’s age = y – 5 According to the question, x – 5 = 5 (y – 5) .... (1) and x = 3y ....(2) ∴ From eqn (1) and (2), we have y = 10 and x = 30 years. Hence, father’s present age = 30 years.