What is x when 57 divided by x equals 39?

To find the answer, just divide the dividend by the quotient: 57 ÷ 39 = 1.4615384615385

To prove this, let's compute 57 divided by 1.4615384615385: $\frac{57}{1.4615384615385} = 39$

How does it work?

Asking what the value of x could be when 57 divided by x gives a result of 39, is equivalent to solving the following equation:

$\frac{57}{x} = 39$

Multiply both sides by x: $\frac{57 x}{x} = 39 x$
$\frac{57 x}{x}$ is equivalent to $\frac{x}{x} \times 57$ , which simplifies to $1 \times 57$ (or just $57$ ).
Thus, the equation becomes: $57 = 39 x$
To find x, divide both sides by 39: $\frac{57}{39} = \frac{39 x}{39}$
Which gives, after simplification: $1.4615384615385 = x$ (or $x = 1.4615384615385$ )

So, if the dividend is 57 and the quotient is 39, the divisor is 1.4615384615385.