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. 14 of Exercise 21.4

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The cost of preparing the walls of a room 12 m long at the rate of Rs. 1.35 per square metre is Rs. 340.20 and the cost of matting the floor at 85 paise per square metre is Rs. 91.80. Find the height of the room.


Length of room = 12 m

Let width of room = b metre

Let height of room = h metre


Area of floor = 12b m2

Cost of matting floor @rate 85 paise per square metre = Rs.91.80



Breadth of room = 9 m

Area of 4 walls =

Cost of preparing walls at rate Rs.1.35 per square metre = Rs.340.20



Height of room = 6 m

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