What is x when 87 divided by x equals 80?

To find the answer, just divide the dividend by the quotient: 87 ÷ 80 = 1.0875

To prove this, let's compute 87 divided by 1.0875: $\frac{87}{1.0875} = 80$

How does it work?

Asking what the value of x could be when 87 divided by x gives a result of 80, is equivalent to solving the following equation:

$\frac{87}{x} = 80$

Multiply both sides by x: $\frac{87 x}{x} = 80 x$
$\frac{87 x}{x}$ is equivalent to $\frac{x}{x} \times 87$ , which simplifies to $1 \times 87$ (or just $87$ ).
Thus, the equation becomes: $87 = 80 x$
To find x, divide both sides by 80: $\frac{87}{80} = \frac{80 x}{80}$
Which gives, after simplification: $1.0875 = x$ (or $x = 1.0875$ )

So, if the dividend is 87 and the quotient is 80, the divisor is 1.0875.