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4 December, 20:28

An open box can hold 80 cm3. It is made from a square piece of tinplate with 3 cm squares cut from each of its 4 corners. Find the dimensions of the original piece of tinplate.

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  1. 4 December, 20:51
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    Let the side of the square plate be x cm.

    The height of the box is 3 cm.

    The length & width are both (x-6) cm.

    volume = length*width*height

    =3 * (x-6) * (x-6)

    =80

    x can then be obtained by solving

    3 (x-6) (x-6) = 80
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