Question

The length breadth and height of a brick are 20 cm, 15 cm, 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
1. 12450
2. 11250
3. 6750
4. None of the above

Answer 1

Correct Answer - Option 3 : 6750

Given:

Dimensions of brick

length = 20 cm = 0.20 m

breadth = 15 cm = 0.15 m

height = 10 cm = 0.10 m

Dimentions of wall 

length = 45 m 

breadth = 0.15 m

height = 3 m 

Formula used: 

Volume of cuboid = length × breadth × height

Number of brick = Volume of the wall/Volume of brick 

Calculation:

According to the formula,

⇒ The volume of the wall = 45 × 0.15 × 3 m³

⇒ Volume of brick = 0.20 × 0.15 × 0.10 m³

⇒ Number of brick = (45 × 0.15 × 3)/( 0.20 × 0.15 × 0.10)

⇒ Number of brick = 6750

∴ The number of bricks required to construct a wall is 6750.