What is x when 21 divided by x equals 72?

In other words, what would the divisor be if the dividend were 21 and the quotient 72?

To find the answer, just divide the dividend by the quotient: 21 ÷ 72 = 0.29166666666667

To prove this, let's compute 21 divided by 0.29166666666667: 21 0.29166666666667 = 72

How does it work?

Asking what the value of x could be when 21 divided by x gives a result of 72, is equivalent to solving the following equation:

21 x = 72

  1. Multiply both sides by x: 21 x x = 72 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 = 72 x
  4. To find x, divide both sides by 72: 21 72 = 72 x 72
  5. Which gives, after simplification: 0.29166666666667 = x (or x = 0.29166666666667 )

So, if the dividend is 21 and the quotient is 72, the divisor is 0.29166666666667.