15 divided by what equals 21?

15 divided by what equals 21? In other words, you have 15 and you divide it by something and then you get 21. What is that something?

We will call that something "X". Here is the equation to find the solution:

		15
		X

= 21

First, multiply both sides by X to get rid of the X as denominator.

		15(X)
		X

= 21(X)

15 = 21X

Then, divide both sides by 21 to get X by itself as follows:

		15
		21

		21X
		21

0.714 = X

Thus, the answer to "15 divided by what equals 21?" is 0.714.

Note that our answers are rounded to the nearest thousandth if necessary. You can divide 15 by 0.714 to check that we got the right answer.

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