What is x when 91 divided by x equals 42?

To find the answer, just divide the dividend by the quotient: 91 ÷ 42 = 2.1666666666667

To prove this, let's compute 91 divided by 2.1666666666667: $\frac{91}{2.1666666666667} = 42$

How does it work?

Asking what the value of x could be when 91 divided by x gives a result of 42, is equivalent to solving the following equation:

$\frac{91}{x} = 42$

Multiply both sides by x: $\frac{91 x}{x} = 42 x$
$\frac{91 x}{x}$ is equivalent to $\frac{x}{x} \times 91$ , which simplifies to $1 \times 91$ (or just $91$ ).
Thus, the equation becomes: $91 = 42 x$
To find x, divide both sides by 42: $\frac{91}{42} = \frac{42 x}{42}$
Which gives, after simplification: $2.1666666666667 = x$ (or $x = 2.1666666666667$ )

So, if the dividend is 91 and the quotient is 42, the divisor is 2.1666666666667.