The perimeter of flag (rectangle) is 2 (L + W). From given information, length (L) is twice as width (W). From this, you can rewrite the equation as:
Perimeter = 2 ( 2W + W ) = 120. To make it simpler, rewrite as 2 (3W) = 120 ---> 6W = 120.
After calculating/solving for W, you will get W = 20.
Let's go back and plug this value into perimeter equation 2 ( 2W + W) =120 to find out the length and width.
The Width is 20 and length is twice that which it gives 40.
Since the unit is in inches, Length = 40 in, and Width = 20 in.
Plug these two measurements into the equation 2 (L + W) = 120 to see if it comes out to be true.
2 (40 + 20) = 120 2 (60) = 120 120 = 120 It works. Finally, Length = 40 in and Width = 20 in.
I hope my work isn't too long. Good luck to you,