The perimeter of a rectangle is 48 in. If the length is twice the width, what is the length of the rectangle?

Length##=16## inches

Let ##l## be the length and ##w##, width.

It is stated that, ##l=2w................(1)##.

Now, the perimeter of the rectangle##=48##.

## rArr 2(l+w)=48, or, l+w=24##

## rArr 3w=24...............[by(1)]##

##:. w=8, &, so, l=2w=16## inches.