50 % of a number is more than 20 % of 650 by 190 . find the number ?
"( 50 / 100 ) * x â € “ ( 20 / 100 ) * 650 = 190 1 / 2 x = 320 x = 640 answer : a"
divide(multiply(add(divide(multiply(650, 20), const_100), 190), const_100), 50)