21 divided by what equals 40?

21 divided by what equals 40? In other words, you have 21 and you divide it by something and then you get 40. What is that something?

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

		21
		X

= 40

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

		21(X)
		X

= 40(X)

21 = 40X

Then, divide both sides by 40 to get X by itself as follows:

		21
		40

		40X
		40

0.525 = X

Thus, the answer to "21 divided by what equals 40?" is 0.525.

Note that our answers are rounded to the nearest thousandth if necessary. You can divide 21 by 0.525 to check that we got the right answer.

Divided By What Equals Calculator
Please enter another problem for us to solve below:

21 divided by what equals 41?
Go here for the next problem we solved.