Question 5688
Let's start with Perimeter Formula for a rectangle: P = 2L + 2W.


They told us that the perimeter is 240, so 2L + 2W = 240.


"The length is twice the width." Since the length is obviously longer as mentioned, we need to double the (shorter) width to equal the length, so L = 2W


Substitute 2W for L in the perimeter equation so that you'll only be solving for 1 unknown variable. 2(2W) + 2W = 240.


4W + 2W = 240


6W = 240


W = 40 inches.


We've got to find the length now. Since the length is double the width, the length would be 80 inches.


So the dimensions would be Width = 40 inches and Length = 80 inches.