Question

A wall measures 250 cm by 8 cm. It is covered with tiles, each 10 cm by 20 cm. How many tiles are used to cover the wall?

Answer 1

Required Answer :

The number of tiles used to cover the wall = 10

Given :

• Length of a wall = 250 cm
• Breadth of a wall = 8 cm
• Length of the tiles = 10 cm
• Breadth of the tiles = 20 cm

To find :

• Number of tiles used to cover the wall

Solution :

Firstly, we will calculate the area of the wall and the tiles by using the formula of area of rectangle.

Formula of area of rectangle :

• Area of rectangle = l × b

where,

• l denotes the length of the rectangle
• b denotes the breadth of the rectangle

Area of the wall :

→ Area of wall = l × b

→ Area of wall = 250 × 8

→ Area of wall = 2000

The area of walls = 2000 cm²

Area of the tiles :

→ Area of tiles = l × b

→ Area of tiles = 10 × 20

→ Area of tiles = 200

The area of tiles = 200 cm²

To calculate the number of tiles used to cover the wall, divide the area of walls by the area of tiles.

→ No. of tiles used to cover the wall = Area of walls ÷ Area of tiles

→ No. of tiles used to cover the wall = 2000/200

→ No. of tiles used to cover the wall = 20/2

→ No. of tiles used to cover the wall = 10

Therefore, the number of tiles used to cover the wall = 10