Question

1) A box is made up of wood which is 1 cm thick. The outer dimensions of the box are
5 cm x 4 cm x 7 cm. Find the volume of the wood used.
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Answer 1

Outer volume = 5×4×7 = 140

inner volume = 3 ×2×5 = 30

volume of wood is = 140-3 = 110cm^3

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