A wall 10 m long, 5 m high and 20 cm thick is to be constructed using bricks of dimensions 25 cm × 20 cm × 10 cm. How many bricks are required?

2000

We know that,

Volume of Cuboid = Length × Breadth × Height

We have,

Dimensions of brick = 25 cm × 20 cm × 10 cm

Length of wall = 10 m = 10000 cm

Height of wall = 5 m = 500 cm

Width of wall = 20 cm

So, Volume of each brick = 25 × 20 × 10 = 5000 cm³

= Volume of wall = 1000 × 500 × 20 = 10000000 cm³

= Number of bricks required to construct the wall = \(\frac{10000000 }{5000 }\)  = 2000