What is x when 15 divided by x equals 81?

In other words, what would the divisor be if the dividend were 15 and the quotient 81?

To find the answer, just divide the dividend by the quotient: 15 ÷ 81 = 0.18518518518519

To prove this, let's compute 15 divided by 0.18518518518519: 15 0.18518518518519 = 81

How does it work?

Asking what the value of x could be when 15 divided by x gives a result of 81, is equivalent to solving the following equation:

15 x = 81

  1. Multiply both sides by x: 15 x x = 81 x
  2. 15 x x is equivalent to x x × 15 , which simplifies to 1 × 15 (or just 15 ).
  3. Thus, the equation becomes: 15 = 81 x
  4. To find x, divide both sides by 81: 15 81 = 81 x 81
  5. Which gives, after simplification: 0.18518518518519 = x (or x = 0.18518518518519 )

So, if the dividend is 15 and the quotient is 81, the divisor is 0.18518518518519.