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If you take 20 percent of a number and get 640, then what is that number? In other words, you know that 20 percent of a number is 640 and you want to know what that initial number is.

To solve this problem you multiply 640 by 100 and then divide the total by 20 as follows: (640 x 100) / 20

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

3200


Therefore, the answer to "640 is 20 percent of what number?" is 3200, and you can also derive that 20 percent of 3200 equals 640.

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