The length, breadth and height of a brick are 20 cm, 15 cm and 10 cm respectively. The number of bricks required to construct a wall with dimensions 45 m length, 0.15 m breadth and 3 m height is

Explanation

Convert wall dimensions to cm: 4500 \text{ cm} length, 15 \text{ cm} breadth, and 300 \text{ cm} height. Volume of wall = 4500 \times 15 \times 300 \text{ cm}^3. Volume of one brick = 20 \times 15 \times 10 \text{ cm}^3. Number of bricks = \frac{4500 \times 15 \times 300}{20 \times 15 \times 10} = \frac{20250000}{3000} = 6750.

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