the age of somu is one - third his father ' s . 9 years back he was one - fifth of his father ' s age . what is his persent age ?
explanation : let somu ' s age be x and that of his father be 3 x . so , x - 9 = 3 x - 9 / 5 = x = 18 answer : option b
divide(subtract(multiply(add(const_4, const_1), 9), 9), subtract(add(const_4, const_1), const_3))