A 10 m long, 4 m high and 24 cm thick wall is to be built using bricks having dimensions 25 cm × 12 cm × 8 cm. Number of bricks required is :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 4000
The number of bricks is the volume of the wall divided by the volume of one brick, both in the same unit (cm).
Wall (10 m = 1000 cm, 4 m = 400 cm): \(1000\times400\times24=9{,}600{,}000\) cm3
One brick: \(25\times12\times8=2400\) cm3
Number of bricks: \(\displaystyle\frac{9{,}600{,}000}{2400}=4000\)