SOLUTION: If the perimeter of a rectangle is 420 inches, what is the length if the width is 4 inches less than the length?

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Question 385943: If the perimeter of a rectangle is 420 inches, what is the length if the width is 4 inches less than the length?
Answer by chrisrao(11) About Me  (Show Source):
You can put this solution on YOUR website!
420 = 2*(L + (L-4))
210 = 2L - 4
214 = 2L
107 = L
L = 107