What is x when 21 divided by x equals 9?

In other words, what would the divisor be if the dividend were 21 and the quotient 9?

To find the answer, just divide the dividend by the quotient: 21 ÷ 9 = 2.3333333333333

To prove this, let's compute 21 divided by 2.3333333333333: 21 2.3333333333333 = 9

How does it work?

Asking what the value of x could be when 21 divided by x gives a result of 9, is equivalent to solving the following equation:

21 x = 9

  1. Multiply both sides by x: 21 x x = 9 x
  2. 21 x x is equivalent to x x × 21 , which simplifies to 1 × 21 (or just 21 ).
  3. Thus, the equation becomes: 21 = 9 x
  4. To find x, divide both sides by 9: 21 9 = 9 x 9
  5. Which gives, after simplification: 2.3333333333333 = x (or x = 2.3333333333333 )

So, if the dividend is 21 and the quotient is 9, the divisor is 2.3333333333333.