if y is 40 % greater than x , than x is what % less than y ?
"y = 1.4 x x = y / 1.4 = 10 y / 14 = 5 y / 7 x is 2 / 7 less which is 28.6 % less than y . the answer is b ."
multiply(divide(40, add(40, const_100)), const_100)