[ Tasks with inequalities. Case analysis] $]$

Would the entire population of the Earth, all buildings, and structures fit into a cube with an edge length of 3 kilometers?
The volume of such a cube is $27 \cdot 10^{9} \mathrm{~m}^{3}$. The population of the Earth exceeds $7 \cdot 10^{9}$ people. Therefore, less than 4 m³ is available per person. We can assume that there are more structures per person.

## Answer

It will not fit.