If the perimeter of a rectangular sign is 44cm and the width is 2cm shorter than half the length, th

Discussion in 'Calculator Requests' started by math_celebrity, Nov 9, 2019.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    If the perimeter of a rectangular sign is 44cm and the width is 2cm shorter than half the length, then what are the length and width?

    The perimeter (P) of a rectangle is:
    2l + 2w = P

    We're given P = 44, so we substitute this into the rectangle perimeter equation:
    2l + 2w = 44

    We're also given w = 0.5l - 2. Substitute the into the Perimeter equation:
    2l + 2(0.5l - 2) = 44

    Multiply through and simplify:
    2l + l - 4 = 44

    Combine like terms:
    3l - 4 = 44

    Type this equation into the search engine, and we get:
    l = 16

    Substitute this back into the equation w = 0.5l - 2
    w = 0.5(16) - 2
    w = 8 - 2
    w = 6
     

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