Question

Sabina wants to cover the floor of her room whose length
is 4 m and breadth is 3 m by square tiles. If each square
tile is of side 20 cm, then find the number of tiles required
to cover the floor of her room.
[3 marks]

Answer 1

Length of the room = 4 m = 400 cm
Breadth of the room = 3 m = 300 cm
∴ Area of the floor of the room = Length × Breadth
[1 mark]
⇒ 400 cm × 300 cm = 120000 sq cm
Now, Side of the square tile = 20 cm
Area of the square tile = Side × Side
⇒ 20 cm × 20 cm = 400 sq cm
[1 mark]
So, number of tiles required (n) = $\frac{Areaofthefloor}{Areaofsquaretile}$
⇒ n = $\frac{120000sqcm}{400sqcm}$ = 300

Hence, 300 tiles are required.

[1 mark]