A rectangle has a width that is half its length. If the perimeter of the rectangle is 36 units, what is the length of the rectangle?
Let the length of the rectangle be represented by $L$ and the width by $W$. Since the width is half the length, we have:
$W = \frac{1}{2}L$
The formula for the perimeter $P$ of a rectangle is given by:
$P = 2L + 2W$
Using the information given, you can find the value of $L$.