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If you take 5 percent of a number and get 640, then what is that number? In other words, you know that 5 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 5 as follows: (640 x 100) / 5

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

12800


Therefore, the answer to "640 is 5 percent of what number?" is 12800, and you can also derive that 5 percent of 12800 equals 640.

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