What is x when 87 divided by x equals 28?

To find the answer, just divide the dividend by the quotient: 87 ÷ 28 = 3.1071428571429

To prove this, let's compute 87 divided by 3.1071428571429: $\frac{87}{3.1071428571429} = 28$

How does it work?

Asking what the value of x could be when 87 divided by x gives a result of 28, is equivalent to solving the following equation:

$\frac{87}{x} = 28$

Multiply both sides by x: $\frac{87 x}{x} = 28 x$
$\frac{87 x}{x}$ is equivalent to $\frac{x}{x} \times 87$ , which simplifies to $1 \times 87$ (or just $87$ ).
Thus, the equation becomes: $87 = 28 x$
To find x, divide both sides by 28: $\frac{87}{28} = \frac{28 x}{28}$
Which gives, after simplification: $3.1071428571429 = x$ (or $x = 3.1071428571429$ )

So, if the dividend is 87 and the quotient is 28, the divisor is 3.1071428571429.