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14 October, 18:18

A box is to be constructed from a sheet of cardboard that is 10 cm by 60 cm by cutting out squares of length x by x from each corner and bending up the sides. What is the maximum volume this box could have?

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  1. 14 October, 18:40
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    Volume of a rectangular box = length x width x height

    From the problem statement,

    length = 60 - 2x

    width = 10 - 2x

    height = x

    where x is the height of the box or the side of the equal squares from each corner and turning up the sides

    V = (60-2x) (10-2x) (x)

    V = (60 - 2x) (10x - 2x^2)

    V = 600x - 120x^2 - 20x^2 + 4x^3

    V = 4x^3 - 100x^2 + 600x

    To maximize the volume, we differentiate the expression of the volume and equate it to zero.

    V = 4x^3 - 100x^2 + 600x

    dV/dx = 12x^2 - 200x + 600

    12x^2 - 200x + 600 = 0

    x^2 - 50/3x + 50 = 0

    Solving for x,

    x1 = 12.74; Volume = - 315.56 (cannot be negative)

    x2 = 3.92; Volume = 1056.31

    So, the answer would be that the maximum volume would be 1056.31 cm^3.
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