What is x when 55 divided by x equals 7?

To find the answer, just divide the dividend by the quotient: 55 ÷ 7 = 7.8571428571429

To prove this, let's compute 55 divided by 7.8571428571429: $\frac{55}{7.8571428571429} = 7$

How does it work?

Asking what the value of x could be when 55 divided by x gives a result of 7, is equivalent to solving the following equation:

$\frac{55}{x} = 7$

Multiply both sides by x: $\frac{55 x}{x} = 7 x$
$\frac{55 x}{x}$ is equivalent to $\frac{x}{x} \times 55$ , which simplifies to $1 \times 55$ (or just $55$ ).
Thus, the equation becomes: $55 = 7 x$
To find x, divide both sides by 7: $\frac{55}{7} = \frac{7 x}{7}$
Which gives, after simplification: $7.8571428571429 = x$ (or $x = 7.8571428571429$ )

So, if the dividend is 55 and the quotient is 7, the divisor is 7.8571428571429.