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.the perimeter of a rectangle is 30 m more than three times its width. if the perimeter is 84 m, find the length and width of the rectangle.

  • math -

    width --- w
    length --- l

    2w + 2l = 84
    w+l = 42

    3w = 84 - 30
    3w = 54
    w = 18
    l = 42-18 = 24

    width = 18, length = 24

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