two numbers are respectively 19 % and 40 % more than a third number . the percentage that is first of the second is ?
i ii iii 119 140 100 140 - - - - - - - - - - 119 100 - - - - - - - - - - - ? = > 15 % answer : a
subtract(const_100, multiply(divide(add(19, const_100), add(40, const_100)), const_100))