20 % of a number is more than 40 % of 140 by 80 . find the number ?
"( 20 / 100 ) * x – ( 40 / 100 ) * 140 = 80 1 / 5 x = 136 x = 680 answer : a"
divide(multiply(add(divide(multiply(140, 40), const_100), 80), const_100), 20)