What is x when 42 divided by x equals 66?

To find the answer, just divide the dividend by the quotient: 42 ÷ 66 = 0.63636363636364

To prove this, let's compute 42 divided by 0.63636363636364: $\frac{42}{0.63636363636364} = 66$

How does it work?

Asking what the value of x could be when 42 divided by x gives a result of 66, is equivalent to solving the following equation:

$\frac{42}{x} = 66$

Multiply both sides by x: $\frac{42 x}{x} = 66 x$
$\frac{42 x}{x}$ is equivalent to $\frac{x}{x} \times 42$ , which simplifies to $1 \times 42$ (or just $42$ ).
Thus, the equation becomes: $42 = 66 x$
To find x, divide both sides by 66: $\frac{42}{66} = \frac{66 x}{66}$
Which gives, after simplification: $0.63636363636364 = x$ (or $x = 0.63636363636364$ )

So, if the dividend is 42 and the quotient is 66, the divisor is 0.63636363636364.