if 30 % of ( x - y ) = 20 % of ( x + y ) , then what percent of x is y ?
"30 % of ( x - y ) = 20 % of ( x + y ) 30 / 100 ( x - y ) = 20 / 100 ( x + y ) x = 5 y required percentage = y / x * 100 = y / 5 y * 100 = 20 % answer is e"
multiply(divide(subtract(30, 20), add(30, 20)), const_100)