What is x when 31 divided by x equals 18?

To find the answer, just divide the dividend by the quotient: 31 ÷ 18 = 1.7222222222222

To prove this, let's compute 31 divided by 1.7222222222222: $\frac{31}{1.7222222222222} = 18$

How does it work?

Asking what the value of x could be when 31 divided by x gives a result of 18, is equivalent to solving the following equation:

$\frac{31}{x} = 18$

Multiply both sides by x: $\frac{31 x}{x} = 18 x$
$\frac{31 x}{x}$ is equivalent to $\frac{x}{x} \times 31$ , which simplifies to $1 \times 31$ (or just $31$ ).
Thus, the equation becomes: $31 = 18 x$
To find x, divide both sides by 18: $\frac{31}{18} = \frac{18 x}{18}$
Which gives, after simplification: $1.7222222222222 = x$ (or $x = 1.7222222222222$ )

So, if the dividend is 31 and the quotient is 18, the divisor is 1.7222222222222.