Question

The internal dimensions of a closed box, made up of iron 1 cm thick, are 24 cm by 18 cm by
12 cm. Find the volume of iron in the box.
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Answer 1

Internal volume of the box =  l × b × h     = 24 × 18 × 12 = 5184 cm 3

External length = [24 + (1 + 1)] = 26 cm

External breadth = [18 + (1 + 1)] = 20 cm

External height = [12 + (1 + 1)] = 14 cm

External volume = 26 × 20 × 14 = 7280  cm 3

Volume of Iron box =  7280 − 5184  = 2096 cm 3

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