Question

A courtyard 20m long and 15m broad is to be paved with bricks of length 25cm and breadth 12m find number of bricks

Answer 1

No. Of bricks = Dimension of Courtyard ÷ Dimension of 1 Brick.

⇒ 20 × 15 / 0.25 × 12
⇒ 100 

So the answer is 100 Bricks.

Answer 2

Number of bricks to be paved = Area of courtyard/Area of each brick
According to the question, 
Area of courtyard 
= 2000 x 1500
Area of each brick
= 25 x 1200

Number of bricks = (2000 x 1500)/(25 x 1200)
= 3000000/30000
= 100 bricks 

Hope that helps !!