What is x when 81 divided by x equals 7?

To find the answer, just divide the dividend by the quotient: 81 ÷ 7 = 11.571428571429

To prove this, let's compute 81 divided by 11.571428571429: $\frac{81}{11.571428571429} = 7$

How does it work?

Asking what the value of x could be when 81 divided by x gives a result of 7, is equivalent to solving the following equation:

$\frac{81}{x} = 7$

Multiply both sides by x: $\frac{81 x}{x} = 7 x$
$\frac{81 x}{x}$ is equivalent to $\frac{x}{x} \times 81$ , which simplifies to $1 \times 81$ (or just $81$ ).
Thus, the equation becomes: $81 = 7 x$
To find x, divide both sides by 7: $\frac{81}{7} = \frac{7 x}{7}$
Which gives, after simplification: $11.571428571429 = x$ (or $x = 11.571428571429$ )

So, if the dividend is 81 and the quotient is 7, the divisor is 11.571428571429.