What is x when 85 divided by x equals 21?

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

To find the answer, just divide the dividend by the quotient: 85 ÷ 21 = 4.047619047619

To prove this, let's compute 85 divided by 4.047619047619: 85 4.047619047619 = 21

How does it work?

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

85 x = 21

  1. Multiply both sides by x: 85 x x = 21 x
  2. 85 x x is equivalent to x x × 85 , which simplifies to 1 × 85 (or just 85 ).
  3. Thus, the equation becomes: 85 = 21 x
  4. To find x, divide both sides by 21: 85 21 = 21 x 21
  5. Which gives, after simplification: 4.047619047619 = x (or x = 4.047619047619 )

So, if the dividend is 85 and the quotient is 21, the divisor is 4.047619047619.