What is x when 40 divided by x equals 39?

To find the answer, just divide the dividend by the quotient: 40 ÷ 39 = 1.025641025641

To prove this, let's compute 40 divided by 1.025641025641: $\frac{40}{1.025641025641} = 39$

How does it work?

Asking what the value of x could be when 40 divided by x gives a result of 39, is equivalent to solving the following equation:

$\frac{40}{x} = 39$

Multiply both sides by x: $\frac{40 x}{x} = 39 x$
$\frac{40 x}{x}$ is equivalent to $\frac{x}{x} \times 40$ , which simplifies to $1 \times 40$ (or just $40$ ).
Thus, the equation becomes: $40 = 39 x$
To find x, divide both sides by 39: $\frac{40}{39} = \frac{39 x}{39}$
Which gives, after simplification: $1.025641025641 = x$ (or $x = 1.025641025641$ )

So, if the dividend is 40 and the quotient is 39, the divisor is 1.025641025641.