SOLUTION: The width of a rectangle is 15ft. less that its length, and the perimeter is 210 ft. Find the width?

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Question 204103: The width of a rectangle is 15ft. less that its length, and the perimeter is 210 ft. Find the width?
Answer by RAY100(1637) About Me  (Show Source):
You can put this solution on YOUR website!
Perimeter =210 =2l +2w,,,but w=l-15,,,
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210 = 2l +2(l-15)
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210 =2l + 2l -30
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240 = 4l
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60 = l,,,,,w= l-15 =60-15 = 45
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check per=210= 2*60 +2*45 = 120 +90,,,,,,ok