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9 divided by what equals 21?


9 divided by what equals 21? In other words, you have 9 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:

   
9
 
   
X
 
  = 21

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

   
9(X)
 
   
X
 
  = 21(X)

  9 = 21X

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

   
9
 
   
21
 
  =
   
21X
 
   
21
 

  0.429 = X

Thus, the answer to "9 divided by what equals 21?" is 0.429.

Note that our answers are rounded to the nearest thousandth if necessary. You can divide 9 by 0.429 to check that we got the right answer.




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