The area of a rectangle is length times width.
If the area is 300 sq. in. when it's cut in half, then the entire area is 600 sq. in.
The width is 1/6 of the length.
Putting that together, we have
600 = (L)(1/6 L)
600 = 1/6 L^2 multiply each side by 6
3600 = L^2 take the square root of each side
60 = L
So the lenght is 60 inches and the width is 1/6 of that, or 10 inches.
