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21 May, 12:36

The length of a rectangle is one inch less than three times its width. If the perimeter of the rectangle is 54 inches, find the length.

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  1. 21 May, 15:40
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    Answer: 20;

    w - width

    3w - 1 - length

    54 in - perimeter

    w + w + (3w - 1) + (3w - 1) = 8w - 2 - perimeter

    The equation:

    8w - 2 = 54 add 2 to both sides

    8w = 56 divide both sides by 8

    w = 7

    3w - 1 = 3 (7) - 1 = 21 - 1 = 20

    Answer: The length = 20 in.
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