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If you take 45 percent of a number and get 405, then what is that number? In other words, you know that 45 percent of a number is 405 and you want to know what that initial number is.

To solve this problem you multiply 405 by 100 and then divide the total by 45 as follows: (405 x 100) / 45

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

900


Therefore, the answer to "405 is 45 percent of what number?" is 900, and you can also derive that 45 percent of 900 equals 405.

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