A 10 m long, 4 m high and 24 cm thick wall is to be built using bricks having dimensions $25\, cm \times 12\,  cm \times 8\, cm $. Number of bricks required is :

4000

Volume of Cuboid = Length × Breadth × Height

Calculation:

Firstly, convert the wall dimensions from m to cm,

⇒ Length of wall  = 10 m = 10 × 100 = 1000 cm

⇒ Height of wall =4 m = 4 × 100 = 400 cm

⇒ Width of the wall = 24 cm

⇒ Volume of wall = 1000×400×24= 9600000 cm3

⇒ Volume of each brick = 25×12×8=2400 cm³

⇒ Number of bricks required to construct the wall = Volume of wall ÷ Volume of each brick

= 9600000 / 2400 = 4000