RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Mensuration-II (Volumes and Surface Areas of a Cuboid and a Cube)

Subject: Maths - Class 8th

Q. No. 7 of Exercise 21.4

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A closed iron tank 12 m long, 9 m wide and 4 m deep is to be made. Determine the cost of iron sheet used at the rate of Rs. 5 per metre sheet, sheet being 2 m wide.


Length of tank = 12 m

Width of tank = 9m

Depth of tank = 4m


Area of sheet required = total surface area of tank








Cost of iron sheet at rate Rs.5 per metre = 5×192 = Rs. 960

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