Answer:
\[\because \] Volume of cube \[=\text{ }{{\left( side \right)}^{3}}\] Given: side of cube = 3m So, volume of cube \[=\text{ }{{\left( 3 \right)}^{3}}\] \[=\text{ }27\text{ }{{m}^{3}}\] and Volume of cuboid = length \[\times \] breadth \[\times \] height \[=18\times 12\times 9\text{ }{{m}^{3}}\] \[Therefore,\text{ }Number\text{ }of\text{ }cubes\text{ }=\frac{Volume\text{ }\left( cuboid \right)}{Volume\text{ }\left( cube \right)}\] \[=\frac{18\times 12\times 9}{27}=72\]
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