The length of a rectangle is three times as long as the width. Find the dimensions if he perimeter is 72 inches

Let l be the length of the rectangle and w be the width of the rectangle.

We have the equations:

l = 3w and 2l + 2w = 72;

So, we solve the equation 6w + 2w = 72;

8w = 72;

w = 72:8;

w = 9 inchesl

l = 3·9;

l = 27 inches.

The dimensions of the rectangle are 27 inches and 9 inches.