Patrick wants to construct a wall and he uses the formula $n=8lh$ to estimate the number of bricks $'n'$ needed to build a wall, $l$ is the length of the wall and $h$ is the height. Which of the following correctly expresses $l$ in terms of $n$ and $h$.

Question

$\begin{array}{1 1} (a)\; l=\frac{8}{nh} \\ (b)\;l =\frac{h}{8n} \\ (c)\; l=\frac{n}{8h} \\ (d)\; l=\frac{n}{8+h} \end{array}$