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If you take 20 percent of a number and get 129, then what is that number? In other words, you know that 20 percent of a number is 129 and you want to know what that initial number is.

To solve this problem you multiply 129 by 100 and then divide the total by 20 as follows: (129 x 100) / 20

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

645


Therefore, the answer to "129 is 20 percent of what number?" is 645, and you can also derive that 20 percent of 645 equals 129.

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