Question

9. A tank is 20m in length, 15m in breadth and 4m
in depth. Find the cost of cementing its floor and
the four walls at the rate of 50 per square metre.
Sumf
​

Answer 1

Given length of swimming pool =20m
Breadth of swimming pool =15m
Height of swimming pool =4m
Curved surface area of cuboid =2(l+b)h
=2[20+15]×4
=2×35×4
CSA of cuboid (pool)=280m
2

If cost of painting is =20 Rs/sq. m
then cost of painting four walls of pool =20×280
Cost =5600Rs.
Hence cost of painting four walls of swimming pool is Rs. 5600.


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