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25 August, 07:10

the perimeter of a rectangle is 78 units. the length is 5 units more than 3 times the width. find the length and width of the rectangle.

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  1. 25 August, 10:52
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    Width=w

    So length = 2w + 3

    Perimeter = 2 (length + width)

    78 = 2 (2w + 3 + w)

    39 = 2w + 3 + w

    39 = 3w + 3

    36=3w

    18 = w

    l=w+3 = 18 + 3=21

    so dimensions are

    length=l=21

    width = w = 18
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