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If you take 9 percent of a number and get 640, then what is that number? In other words, you know that 9 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 9 as follows: (640 x 100) / 9

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

7111.11


Therefore, the answer to "640 is 9 percent of what number?" is 7111.11, and you can also derive that 9 percent of 7111.11 equals 640.

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