What is x when 76 divided by x equals 21?

To find the answer, just divide the dividend by the quotient: 76 ÷ 21 = 3.6190476190476

To prove this, let's compute 76 divided by 3.6190476190476: $\frac{76}{3.6190476190476} = 21$

How does it work?

Asking what the value of x could be when 76 divided by x gives a result of 21, is equivalent to solving the following equation:

$\frac{76}{x} = 21$

Multiply both sides by x: $\frac{76 x}{x} = 21 x$
$\frac{76 x}{x}$ is equivalent to $\frac{x}{x} \times 76$ , which simplifies to $1 \times 76$ (or just $76$ ).
Thus, the equation becomes: $76 = 21 x$
To find x, divide both sides by 21: $\frac{76}{21} = \frac{21 x}{21}$
Which gives, after simplification: $3.6190476190476 = x$ (or $x = 3.6190476190476$ )

So, if the dividend is 76 and the quotient is 21, the divisor is 3.6190476190476.