What is x when 51 divided by x equals 23?

To find the answer, just divide the dividend by the quotient: 51 ÷ 23 = 2.2173913043478

To prove this, let's compute 51 divided by 2.2173913043478: $\frac{51}{2.2173913043478} = 23$

How does it work?

Asking what the value of x could be when 51 divided by x gives a result of 23, is equivalent to solving the following equation:

$\frac{51}{x} = 23$

Multiply both sides by x: $\frac{51 x}{x} = 23 x$
$\frac{51 x}{x}$ is equivalent to $\frac{x}{x} \times 51$ , which simplifies to $1 \times 51$ (or just $51$ ).
Thus, the equation becomes: $51 = 23 x$
To find x, divide both sides by 23: $\frac{51}{23} = \frac{23 x}{23}$
Which gives, after simplification: $2.2173913043478 = x$ (or $x = 2.2173913043478$ )

So, if the dividend is 51 and the quotient is 23, the divisor is 2.2173913043478.