two numbers are respectively 35 % and 50 % more than a third number . the percentage that is first of the second is ?
"i ii iii 135 150 100 150 - - - - - - - - - - 135 100 - - - - - - - - - - - ? = > 90 % answer : a"
subtract(const_100, multiply(divide(add(35, const_100), add(50, const_100)), const_100))