SOLUTION: the width of a rectangle is 15 feet less than its length, and the perimeter is 210 feet. find the width.

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Question 199866: the width of a rectangle is 15 feet less than its length, and the perimeter is 210 feet. find the width.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
W=L-15
2W+2L=210
2(L-15)+2L=210
2L-30+2L=210
4L=210+30
4L=240
L=240/4
L=60 ANS. FOR THE LENGTH.
W=60-15=45 ANS. FOR THE WIDTH.
PROOF:
2*45+2*60=210
90+120=210
210=210