Stream of consciousness rationale: Let L be the length and W be the width of the rectangle. Hence L = 4 * W. We now use the area to write 80 = L * W. Substitute L by 4 W in the equation above 80 = 4 * W × W = 4 W^2. Solve for W and find L. 4 W^2 = 100. W^2 = 25, W = 5 and. L = 4 * 5 = 20 m.
The question and answer pair are described below.
Q: The length of a rectangle is four times its width. If the area is 100 m2. what is the length of the rectangle?
A: 20