if 50 % of x is 20 less than 5 % of 500 , then x is ?
50 % of x = x / 2 ; 5 % of 500 = 5 / 100 * 500 = 25 given that , x / 2 = 25 - 20 = > x / 2 = 5 = > x = 10 . answer : e
divide(subtract(multiply(500, divide(5, const_100)), 20), divide(50, const_100))