What is x when 80 divided by x equals 81?

To find the answer, just divide the dividend by the quotient: 80 ÷ 81 = 0.98765432098765

To prove this, let's compute 80 divided by 0.98765432098765: $\frac{80}{0.98765432098765} = 81$

How does it work?

Asking what the value of x could be when 80 divided by x gives a result of 81, is equivalent to solving the following equation:

$\frac{80}{x} = 81$

Multiply both sides by x: $\frac{80 x}{x} = 81 x$
$\frac{80 x}{x}$ is equivalent to $\frac{x}{x} \times 80$ , which simplifies to $1 \times 80$ (or just $80$ ).
Thus, the equation becomes: $80 = 81 x$
To find x, divide both sides by 81: $\frac{80}{81} = \frac{81 x}{81}$
Which gives, after simplification: $0.98765432098765 = x$ (or $x = 0.98765432098765$ )

So, if the dividend is 80 and the quotient is 81, the divisor is 0.98765432098765.