Let the age of the son be x. ⇒ Age of father = 4x + 2 Age of father after 3 years = 4x + 5 Age of son after 3 years = x + 3 According to problem, father’s age after 3 years = 15 + 2(x + 3) Equating the two ages of the father, we get 4x + 5 = 15 + 2(x + 3) 2x = 16 x = 8 Therefore, age of son is 8 years.