What is x when 12 divided by x equals 21?

In other words, what would the divisor be if the dividend were 12 and the quotient 21?

To find the answer, just divide the dividend by the quotient: 12 ÷ 21 = 0.57142857142857

To prove this, let's compute 12 divided by 0.57142857142857: 12 0.57142857142857 = 21

How does it work?

Asking what the value of x could be when 12 divided by x gives a result of 21, is equivalent to solving the following equation:

12 x = 21

  1. Multiply both sides by x: 12 x x = 21 x
  2. 12 x x is equivalent to x x × 12 , which simplifies to 1 × 12 (or just 12 ).
  3. Thus, the equation becomes: 12 = 21 x
  4. To find x, divide both sides by 21: 12 21 = 21 x 21
  5. Which gives, after simplification: 0.57142857142857 = x (or x = 0.57142857142857 )

So, if the dividend is 12 and the quotient is 21, the divisor is 0.57142857142857.