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If you take 20 percent of a number and get 643, then what is that number? In other words, you know that 20 percent of a number is 643 and you want to know what that initial number is.

To solve this problem you multiply 643 by 100 and then divide the total by 20 as follows: (643 x 100) / 20

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

3215


Therefore, the answer to "643 is 20 percent of what number?" is 3215, and you can also derive that 20 percent of 3215 equals 643.

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