What is x when 91 divided by x equals 20?

To find the answer, just divide the dividend by the quotient: 91 ÷ 20 = 4.55

To prove this, let's compute 91 divided by 4.55: $\frac{91}{4.55} = 20$

How does it work?

Asking what the value of x could be when 91 divided by x gives a result of 20, is equivalent to solving the following equation:

$\frac{91}{x} = 20$

Multiply both sides by x: $\frac{91 x}{x} = 20 x$
$\frac{91 x}{x}$ is equivalent to $\frac{x}{x} \times 91$ , which simplifies to $1 \times 91$ (or just $91$ ).
Thus, the equation becomes: $91 = 20 x$
To find x, divide both sides by 20: $\frac{91}{20} = \frac{20 x}{20}$
Which gives, after simplification: $4.55 = x$ (or $x = 4.55$ )

So, if the dividend is 91 and the quotient is 20, the divisor is 4.55.