if 50 % of ( x - y ) = 30 % of ( x + y ) , then what percent of x is y ?
"50 % of ( x - y ) = 30 % of ( x + y ) 50 / 100 ( x - y ) = 30 / 100 ( x + y ) x = 4 y required percentage = y / x * 100 = y / 4 y * 100 = 25 % answer is c"
multiply(divide(subtract(50, 30), add(50, 30)), const_100)