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The perimeter of a rectangle is 122 feet and the length is 10 times longer than twice the width. Find the dimension.

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L = 10(2W) = 20W

122 = 2L + 2W

Substitute 20W for L

122 = 2(20W) + 2W = 42W

Divide both sides by 42 to find W, then calculate L.

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