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math

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the dimensions of a door are 3ft by 7ft 6in. if the same amount is added to each dimension of the door, the area is increased by 18ft^2. Find the dimensions of the new door.

  • math -

    (3+x)(7.5+x) = 3*7.5+18
    x = 3/2

    new dimensions: 4'6" by 9'0"

    check:
    3*7.5 = 22.5
    4.5*9 = 40.5

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