What is x when 21 divided by x equals 45?

In other words, what would the divisor be if the dividend were 21 and the quotient 45?

To find the answer, just divide the dividend by the quotient: 21 ÷ 45 = 0.46666666666667

To prove this, let's compute 21 divided by 0.46666666666667: 21 0.46666666666667 = 45

How does it work?

Asking what the value of x could be when 21 divided by x gives a result of 45, is equivalent to solving the following equation:

21 x = 45

  1. Multiply both sides by x: 21 x x = 45 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 = 45 x
  4. To find x, divide both sides by 45: 21 45 = 45 x 45
  5. Which gives, after simplification: 0.46666666666667 = x (or x = 0.46666666666667 )

So, if the dividend is 21 and the quotient is 45, the divisor is 0.46666666666667.