Question

47. What is the number of rectangular tiles of
size 10 cm x8 cm needed to cover the floor
of a room of size 12m x 10 m?
(A) 12000
(B) 15000
(C) 10000
D) 18000​

Answer 1

Answer :

• 15000 slabs are required to cover the floors
• (B)

Given :

Measurements of floors :

• Length = 12m = 1200 cm
• Breadth = 10m = 1000 cm

Measurements of rectangular slab :

• Length = 10cm
• Breadth = 8cm

To find :

• Number of rectangular slabs

Solution :

Given ,

Measurements of floors:

• Length = 1200 cm
• Breadth = 1000 cm

As we know that,

• Area of floors = length × breadth

➼ 1200 × 1000

➼ 1200000 cm²

Also Given that ,

Measurements of rectangular slabs :

• Length = 10cm
• Breadth = 8cm

As we know that ,

• Area of slab = length × breadth

➼ 10 × 8

➼ 80 cm²

Now ,

• Number of slab to require to cover the floors = Area of floors / Area of rectangular slab

➼ 1200000/80

➼ 15000 slabs