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the external dimensions of a closed box are 8cm by 5cm by 4cm. given that the thickness of the wood of which it is made is 0.5cm, find the volume of the wood used to make it.

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So the inner dimensions, which determine the volume are:
8-1 or 7 cm
4 cm
and 3 cm

volume = 7x4x3 cm^3
= 84 cm^3

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