if 60 % of ( x - y ) = 20 % of ( x + y ) , then what percent of x is y ?
"60 % of ( x - y ) = 20 % of ( x + y ) 60 / 100 ( x - y ) = 20 / 100 ( x + y ) 4 x = 8 y required percentage = y / x * 100 = 4 y / 8 y * 100 = 50 % answer is a"
multiply(divide(subtract(60, 20), add(60, 20)), const_100)