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. 10 of Exercise 21.4

Listen NCERT Audio Books to boost your productivity and retention power by 2X.

10

The dimensions of a room are 12.5 m by 9 m by 7 m. There are 2 doors and 4 windows in the room; each door measures 2.5 m by 1.2 m and each window 1.5 m by 1 m. Find the cost of painting the walls at Rs. 3.50 per square metre.

Given,


Dimensions of room = 12.5m ×9m × 7m


Dimensions of each door = 2.5m ×1.2m


Dimensions of each window = 1.5m ×1m


Area of four walls including doors and windows =


=


Area of 2 doors and 4 windows =


Area of only walls = 301 – 12 = 289 m2


Hence,


Cost of painting walls at rate Rs.3.50 per square metre = Rs.(3.50 ×289) = Rs.1011.50


Chapter Exercises

More Exercise Questions