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A man built a walk of uniform width around a rectangular pool. If the area of the walk is 429 square feet and the dimensions of the pool are 10 feet by 18 feet, how wide is the walk?

  • Math -

    area of walk of width w plus pool

    (10+2w)(18+2w) = 180+429 = 609
    4w^2 + 56w + 180 = 609
    (2w-11)(2w+39) = 0
    e = 11/2

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