Find how many cubes fit along each dimension, then multiply.<br><br>
&bull; Along length 40&nbsp;cm: 40 ÷ 5 = 8 cubes<br>
&bull; Along width 25&nbsp;cm: 25 ÷ 5 = 5 cubes<br>
&bull; Along height 20&nbsp;cm: 20 ÷ 5 = 4 cubes<br>
&bull; Total cubes = 8 × 5 × 4<br>
&bull; = 40 × 4<br>
&bull; = 160<br>
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Final Answer: 160 cubes