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The length of a rectangle is twice it's width.
The perimeter of the rectangle is 126 feet.

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Littlestarid
[tex]2L + 2W = 126\\2 (2W) + 2W = 126\\4W + 2W = 126\\6W =126\\\\\boxed{W = 21}\\\\L = W X 2 = 21 X 2\\\\\boxed{ L = 42 }[/tex]

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