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If you take 15 percent of a number and get 81, then what is that number? In other words, you know that 15 percent of a number is 81 and you want to know what that initial number is.

To solve this problem you multiply 81 by 100 and then divide the total by 15 as follows: (81 x 100) / 15

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

540


Therefore, the answer to "81 is 15 percent of what number?" is 540, and you can also derive that 15 percent of 540 equals 81.

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