16. A lane 180 m long and 5 m wide is to be paved with bricks of lengt

1.	16. A lane 180 m long and 5 m wide is to be paved with bricks of length 20 cm and breadth 15 cm.Find the cost of bricks that are required, at the rate of Rs 750 per thousand.
Answer» 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 breadthof the brick. we calculate the areaof a brick:A₂=b×h=20×15=300 cm² we convert the cm² in m² (1m²=10000 cm²)300 cm²=0,03 m²thenA₂=0,03 m² we calculate the required number of bricks:n=A₁/A₂=900/0,03=30000 brickswe calculate the total cost of bricks:tot=(750×30000):1000=22500 ruppes

16. A lane 180 m long and 5 m wide is to be paved with bricks of length 20 cm and breadth 15 cm.Find the cost of bricks that are required, at the rate of Rs 750 per thousand.

Answer»

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 breadthof the brick.

we calculate the areaof a brick:A₂=b×h=20×15=300 cm²

we convert the cm² in m² (1m²=10000 cm²)300 cm²=0,03 m²thenA₂=0,03 m²

we calculate the required number of bricks:n=A₁/A₂=900/0,03=30000 brickswe calculate the total cost of bricks:tot=(750×30000):1000=22500 ruppes