30 % of a number is more than 60 % of 50 by 30 . find the number ?
"( 30 / 100 ) * x – ( 60 / 100 ) * 50 = 30 2 / 7 x = 60 x = 200 answer : b"
divide(multiply(add(divide(multiply(50, 60), const_100), 30), const_100), 30)