What is x when 55 divided by x equals 100?

To find the answer, just divide the dividend by the quotient: 55 ÷ 100 = 0.55

To prove this, let's compute 55 divided by 0.55: $\frac{55}{0.55} = 100$

How does it work?

Asking what the value of x could be when 55 divided by x gives a result of 100, is equivalent to solving the following equation:

$\frac{55}{x} = 100$

Multiply both sides by x: $\frac{55 x}{x} = 100 x$
$\frac{55 x}{x}$ is equivalent to $\frac{x}{x} \times 55$ , which simplifies to $1 \times 55$ (or just $55$ ).
Thus, the equation becomes: $55 = 100 x$
To find x, divide both sides by 100: $\frac{55}{100} = \frac{100 x}{100}$
Which gives, after simplification: $0.55 = x$ (or $x = 0.55$ )

So, if the dividend is 55 and the quotient is 100, the divisor is 0.55.