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Question

A swimming pool is 20 m long 15 m wide and 3 m deep. Find the cost of repairing the floor and wall at the rate of Rs 25 per square metre.

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Solution

Length of the swimming pool=20 mBreadth=15 mHeight=3 mNow, surface area of the floor and all four walls of the pool=(length×breadth)+2×(breadth×height+length×height)=(20×15)+2×(15×3+20×3)=300+2×(45+60)=300+210=510 m2The cost of repairing the floor and the walls is Rs 25/m2. The total cost of repairing 510 m2 area=510×25=Rs 12750

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