What is x when 84 divided by x equals 87?

To find the answer, just divide the dividend by the quotient: 84 ÷ 87 = 0.96551724137931

To prove this, let's compute 84 divided by 0.96551724137931: $\frac{84}{0.96551724137931} = 87$

How does it work?

Asking what the value of x could be when 84 divided by x gives a result of 87, is equivalent to solving the following equation:

$\frac{84}{x} = 87$

Multiply both sides by x: $\frac{84 x}{x} = 87 x$
$\frac{84 x}{x}$ is equivalent to $\frac{x}{x} \times 84$ , which simplifies to $1 \times 84$ (or just $84$ ).
Thus, the equation becomes: $84 = 87 x$
To find x, divide both sides by 87: $\frac{84}{87} = \frac{87 x}{87}$
Which gives, after simplification: $0.96551724137931 = x$ (or $x = 0.96551724137931$ )

So, if the dividend is 84 and the quotient is 87, the divisor is 0.96551724137931.