if 50 % of x is 30 less than 25 % of 1500 , then x is ?
"50 % of x = x / 2 ; 25 % of 1500 = 25 / 100 * 1500 = 375 given that , x / 2 = 375 - 30 = > x / 2 = 345 = > x = 690 . answer : a"
divide(subtract(multiply(1500, divide(25, const_100)), 30), divide(50, const_100))