What is x when 18 divided by x equals 21?

In other words, what would the divisor be if the dividend were 18 and the quotient 21?

To find the answer, just divide the dividend by the quotient: 18 ÷ 21 = 0.85714285714286

To prove this, let's compute 18 divided by 0.85714285714286: 18 0.85714285714286 = 21

How does it work?

Asking what the value of x could be when 18 divided by x gives a result of 21, is equivalent to solving the following equation:

18 x = 21

  1. Multiply both sides by x: 18 x x = 21 x
  2. 18 x x is equivalent to x x × 18 , which simplifies to 1 × 18 (or just 18 ).
  3. Thus, the equation becomes: 18 = 21 x
  4. To find x, divide both sides by 21: 18 21 = 21 x 21
  5. Which gives, after simplification: 0.85714285714286 = x (or x = 0.85714285714286 )

So, if the dividend is 18 and the quotient is 21, the divisor is 0.85714285714286.