20% of a number is 40. what number would it be

The number is 200.

To figure this problem out, you would divide the percentage by 100 (Since percents are out of 100) and this will bring you to its decimal= .20. Then you would simply divide 40 by .2 and get 200. To check your answer, just multiply 200 by .2 and it should equal 40.


Check: 

Using the rise/run rule. you would get 2/6.simp. 1/3