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a circular pool measures 12 feet across. one cubic yard of concrete is to be used to create a circular border of uniform width around the pool. if the border is to have a depth of 3inches, how wide will the border be? (1cubic yard=27cubic feet)

  • math - ,

    If the width is w inches, the volume of the border (in^3) is

    pi((72+w)^2 - 72^2)*3 = 46656
    w = 28.7

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