if 30 % of 100 is greater than 50 % of a number by 10 , then the number is ?
"let the number be x 30 % of 100 - 50 % of x = 10 50 / 100 x = ( 30 / 100 * 100 ) - 10 x / 2 = 20 x = 40 answer is a"
divide(subtract(multiply(divide(30, const_100), 100), 10), divide(50, const_100))