Question

sabina wants to cover the floor of room whose length is 4m and breadth is 3m by square tiles. if each square tile is of side 20cm, then find number of tiles required to cover the floor of her room​

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

= 400 × 300 sq cm = 120000 sq cm 

Side of the square tile = 20 cm 

Area of the square tile = Side × Side = 20 × 20 sq cm 

= 400 sq cm 

So, number of tiles required = Area of the floor/Area of one tile = 120000/400 = 300

Answer 2

Sabina wants to cover the floor of the room whose length is 4 m and breadth is 3 m.

Here..

• Length (l) = 4 m
• Breadth (b) = 3 m

Now,

We know that

Area of rectangle = length × breadth

Before putting values, first we have to change m into cm.

To convert m into cm.. multiply with 100.

So,

• Length (l) = 4 × 100 = 400 cm
• Breadth (b) = 3 × 100 = 300 cm

Area of the floor of the room = (400 × 300) cm²

=> 120000 cm²

Also, we have given that side of each square tile is 20 cm.

So,

Area of square = side × side

=> (20 × 20) cm²

=> 400 cm²

We have to find the number of tiles required to cover the floor of the room.

$\bold{Number\:of\:tiles\:required\:=\:\dfrac{Area\:of\:the\:floor}{Area\:of\:tile}}$

Substitute the known values

=> $\dfrac{120000}{400}$

=> 300

∴ 300 tiles are required to cover the floor of her room.