if 20 % of ( x - y ) = 15 % of ( x + y ) , then what percent of x is y ?
"20 % of ( x - y ) = 15 % of ( x + y ) 20 / 100 ( x - y ) = 15 / 100 ( x + y ) 5 x = 35 y required percentage = y / x * 100 = 5 y / 35 y * 100 = 14.28 % answer is d"
multiply(divide(subtract(20, 15), add(20, 15)), const_100)