18. A lane 180 m long and 5 m wide is to be paved with bricks, of length 20 cm and breadth 150
Find the cost of the bricks that are required, at the rate of 750 per thousand.

We indicate with L length of the lane, with l breadth of the lane.

we calculate the area of a lane:
A₁=L×l=180×5=900 m²

we indicate with b length of the brick , with h breadth of the brick.

we calculate the area of a brick:
A₂=b×h=20×150=3000 cm²

we convert the cm² in m² (1m²=10000 cm²)
3000 cm²=0,3 m²
then
A₂=0,3 m²

we calculate the required number of bricks:
n=A₁/A₂=900/0,3=3000 bricks
we calculate the total cost of bricks:
tot=(750×3000):1000=2250 ruppes

18. A lane 180 m long and 5 m wide is to be paved with bricks, of length 20 cm and breadth 150Find the cost of the bricks that are required, at the rate of 750 per thousand.​

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18. A lane 180 m long and 5 m wide is to be paved with bricks, of length 20 cm and breadth 150
Find the cost of the bricks that are required, at the rate of 750 per thousand.