SOLUTION: The length of a rectangle is 15 feet more than twice its width, and the perimeter is 120 feet. What are the length and width? Two angles are supplementary. One of the angles i

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If we call the length L and the width W, then remember that perimeter is:

We have that the length is 15 more than twice the width, so we can represent length by 2W+15. Thus we have:





So the width is 15 feet. Thus the length would be 2(15)+15=45 feet.