What is x when 21 divided by x equals 85?

In other words, what would the divisor be if the dividend were 21 and the quotient 85?

To find the answer, just divide the dividend by the quotient: 21 ÷ 85 = 0.24705882352941

To prove this, let's compute 21 divided by 0.24705882352941: 21 0.24705882352941 = 85

How does it work?

Asking what the value of x could be when 21 divided by x gives a result of 85, is equivalent to solving the following equation:

21 x = 85

  1. Multiply both sides by x: 21 x x = 85 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 = 85 x
  4. To find x, divide both sides by 85: 21 85 = 85 x 85
  5. Which gives, after simplification: 0.24705882352941 = x (or x = 0.24705882352941 )

So, if the dividend is 21 and the quotient is 85, the divisor is 0.24705882352941.