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If you take 20 percent of a number and get 128, then what is that number? In other words, you know that 20 percent of a number is 128 and you want to know what that initial number is.

To solve this problem you multiply 128 by 100 and then divide the total by 20 as follows: (128 x 100) / 20

When we put that into our calculator, we get the following answer:

640


Therefore, the answer to "128 is 20 percent of what number?" is 640, and you can also derive that 20 percent of 640 equals 128.

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