FATHER and his son is 49 years.Their age ratio is 5 ∶ 2Calculations:Let the ages of a father and son be 5X and 2xAccording to the QUESTION, we have⇒ 5x + 2x = 49 ⇒ 7x = 49 ⇒ X = 7 So, The age of son is 2x + 5⇒ 2x + 5 = 2(7) + 5⇒ 2x + 5 = 19 years∴ The age of son after 5 years is 19 years.