two numbers are respectively 20 % and 25 % more than a third number . so find the percentage that is first of the second is ?
"first - 120 second - 125 third - 100 125 - - - - 120 100 - - - - - 96 answer a"
subtract(const_100, multiply(divide(add(20, const_100), add(25, const_100)), const_100))