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18 April, 10:33

The perimeter of a rectangle is 48. Find the width if it is 5/7 of the length.

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  1. 18 April, 12:21
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    2L + 2w = 48

    w = 5/7L

    2L + 2 (5/7L) = 48

    24/7L = 48

    L = 48 / 24/7

    L = 14

    2L + 2w = 48

    2 (14) + 2w = 48

    28 + 2w = 48

    2w = 20

    w = 10

    To check your work:

    w = 5/7L

    10 = 5/7 (14)

    10 = 10

    The width is 10.
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