Question:
How many bricks, each of size 25 cm × 13.5 cm × 6 cm, will be required to build a wall 8 m long, 5.4 m high and 33 cm thick?
Solution:
Volume of the brick $=25 \times 13.5 \times 6=2025 \mathrm{~cm}^{3}$
Volume of the wall $=800 \times 540 \times 33=14256000 \mathrm{~cm}^{3}$
Total number of bricks $=\frac{\text { Volume of the wall }}{\text { Volume of each brick }}=\frac{14256000}{2025}=7040$ bricks