Question

5. Find the cost of the gravelling a path 1.5m wide,surrounding a rectangular lawn 39m long
and 18m wide with gravel 7.5cm deep at the rate of Rs.20 per cubic meters.​

Answer 1

Answer:

₹243

Step-by-step explanation:

Length of lawn= 39 m

Breadth of lawn= 18 m

Depth of lawn= 7.5 cm= 0.075 m

Volume of the rectangular lawn= l×b×h=[39×18×0.075]m³=52.65 m³

Volume of lawn not to be covered by gravel= [(39-3)×(18-3)×0.075]m³= 40.5 m³

Volume of the path=Volume of lawn- Volume of lawn not to be covered by gravel

                               = [52.65-40.5]m³

                               =12.15 m³

Cost of graveling the path= 12.15×₹ 20=₹243