if 25 % of x is 15 less than 15 % of 1600 , then x is ?
"25 % of x = x / 4 ; 15 % of 1600 = 15 / 100 * 1600 = 240 given that , x / 4 = 240 - 15 = > x / 4 = 225 = > x = 900 . answer : c"
divide(subtract(multiply(1600, divide(15, const_100)), 15), divide(25, const_100))