if 25 % of x is 20 less than 15 % of 1500 , then x is ?
"25 % of x = x / 4 ; 15 % of 1500 = 15 / 100 * 1500 = 225 given that , x / 4 = 225 - 20 = > x / 4 = 205 = > x = 820 . answer : b"
divide(subtract(multiply(1500, divide(15, const_100)), 20), divide(25, const_100))