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14 January, 13:34

The volume of Olivia's rectangular lunchbox is 240 cubic inches. The lunchbox has a height of 3 inches, and its length is 2 inches more than its width. How wide is Olivia's lunchbox?

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  1. 14 January, 13:47
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    Volumn = Height*Width*Length

    Width * (Width+2) = Volumn/Height=240/3=80

    Width^2 + 2Width-80=0

    (Width-8) (Width+10) = 0

    Width>0 - > Width+10>0

    -> Width-8=0 - > Width=8 inches
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