CSEC Mathematics · 2021 · Paper 2 · Question 6(a)

Farmer Brown makes troughs to feed his farm animals, using wood that is 5\text{ cm} thick. As shown in the diagram, the troughs are rectangular-based, open at the top and have external dimensions of 300\text{ cm} by 190\text{ cm} by 160\text{ cm}.

Show, by calculation, that the internal capacity (volume) of the trough is 8\,091\,000\text{ cm}^3.

This question uses a figure or table from the paper — you'll see it when you practise.