What is x when 40 divided by x equals 9?

To find the answer, just divide the dividend by the quotient: 40 ÷ 9 = 4.4444444444444

To prove this, let's compute 40 divided by 4.4444444444444: $\frac{40}{4.4444444444444} = 9$

How does it work?

Asking what the value of x could be when 40 divided by x gives a result of 9, is equivalent to solving the following equation:

$\frac{40}{x} = 9$

Multiply both sides by x: $\frac{40 x}{x} = 9 x$
$\frac{40 x}{x}$ is equivalent to $\frac{x}{x} \times 40$ , which simplifies to $1 \times 40$ (or just $40$ ).
Thus, the equation becomes: $40 = 9 x$
To find x, divide both sides by 9: $\frac{40}{9} = \frac{9 x}{9}$
Which gives, after simplification: $4.4444444444444 = x$ (or $x = 4.4444444444444$ )

So, if the dividend is 40 and the quotient is 9, the divisor is 4.4444444444444.