A brick has dimensions of 20 cm by 10 cm by 7.5 cm. How many such bricks are needed to build a wall measuring 25 m in length, 2 m in height, and 0.75 m in thickness?

Explanation

First, calculate the volume of the wall: 25 m × 2 m × 0.75 m = 37.5 cubic meters. Convert brick dimensions to meters: 0.20 m × 0.10 m × 0.075 m = 0.0015 cubic meters per brick. Divide the wall volume by the brick volume: 37.5 ÷ 0.0015 = 25,000 bricks required.