Question

A courtyard 25 metre long and 16 m broad is to be laid with bricks of length 20 CM and breadth 10 cm find the number of bricks required

Answer 1

Answer:

Given:

A coutyard 25m long and 16m broad is to be laid with bricks of length 20cm and bricks 10cm.

To find:

The number of bricks required.

Explanation:

We have,

Length of the courtyard= 25m

Breadth of the courtyard= 16m

Area of the courtyard= Length × Breadth sq.unit

⇒ Area of the courtyard= [25× 16]m²

⇒ Area of the courtyard= 400m².

We know that 1m²= 10000cm²

then, 400m²= [400× 10000]cm²

Area of the courtyard= 4000000cm².

&

On courtyard laid with bricks,

Length of the bricks= 20cm

Breadth of the bricks= 10cm

⇒ Area of the bricks= [20×10]cm²

⇒ Area of the bricks= 200cm².

Now,

⇒ Number of bricks=  

⇒ Number of bricks=  

⇒ Number of bricks= 20000

Thus,

The number of bricks required is 20000 bricks.

Step-by-step explanation:

Answer 2

Answer:

Area

Step-by-step explanation:

Area of courtyard = l×b = 400m²

Area of each brick = l×b = 200cm²

Now , area of courtyard in cm² = 4000m²

Divide 4000÷200 = 20

Hence , 20 bricks are needed .