Q. 63.9( 23 Votes )

# The length, breadth, and height of a room are 10 m, 2.5 m, and 4 m respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of Rs 10.25 per m2.

Concept Used:

Total Surface Area of Cuboid – Area of ceiling = 2lh + 2bh + lb

Given:

Length of the room = 10 m

The breadth of the room = 2.5 m

The height of the room = 4 m

Assumption: Let l be the length, b the breadth and h the height of the room.

Explanation:

It can be observed that four walls and the ceiling of the room are to be whitewashed.

The floor of the room is not to be white-washed.

The area to be white - washed = Area of walls + Area of the ceiling of the room

= 2lh + 2bh + lb

= [2 × 10 × 2.5 + 2 × 2.5 × 4 + 4 × 10] m2

= (50 + 20 + 40) m2

= 110 m2

Area to be whitewashed = 110 m2

Cost of white-washing per m2 area = Rs 10.25

Cost of white-washing 74 m2 area = Rs (10.25 × 110)

= Rs. 1127.50

Hence, the cost of whitewashing is Rs. 1127.50.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Surface Area and Volume of Right Circular Cylinders42 mins
Surface Area and Volume of Spheres40 mins
Surface Area and Volume of Right Circular Cone37 mins
Quiz | Surface Area & Volumes49 mins
RD Sharma | Surface areas and volumes of Cube & Cuboid33 mins
Surface Area of Right Circular Cylinder52 mins
Surface Area of Right Circular Cylinder49 mins
Surface Area of Cube and Cuboid49 mins
Matter and Its Classification34 mins
Speed and Velocity59 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses