Answer:
Length: 9 inches per side
Width: 3 inches per side
Explanation:
Perimeter = 2*width + 2*length
Perimeter = (2 x W) + (2 x 3W) = 8W.
Since we know P = 24, it is also = 8W
With 24=8W, divide each side by 8, and W = 3.
So if W=3, the width is 3 inches, and the length is 3W, or 3x3 which is 9.