if 25 % of ( x - y ) = 15 % of ( x + y ) , then what percent of x is y ?
"explanation : solution : 25 % of ( x - y ) = 15 % of ( x + y ) 25 ( x - y ) / 100 = 15 ( x + y ) / 100 5 ( x - y ) = 3 ( x + y ) x = 4 y . . ' . required percentage = ( y * 100 / x ) % = y * 100 / 4 y = 25 % answer : d"
multiply(divide(subtract(25, 15), add(25, 15)), const_100)