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5 March, 18:28

A carpenter is assigned the job of expanding a rectangular deck where the width is one-sixth the length. The length of the deck is to be expanded by 4 feet, and the width by 2 feet. If the area of the new rectangular deck is 56 ft2 larger than the area of the original deck, find the dimensions of the original deck.

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  1. 5 March, 19:22
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    Let the area of the original deck be x * x/6

    new deck will have area (x + 4) * (1/6x + 2)

    so we can write the equation

    (x + 4) ((1/6) x + 2) - x^2/6 = 56

    x^2/6 + 2x + 2x/3 + 8 - x^2/6 = 56

    8x / 3 = 48

    x = 144/8 = 18

    so length of original deck = 18 feet and width = 3 feet.
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