Q. 24.4( 440 Votes )

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m2.

Answer :

Given: Length = 5m, Breadth = 4m, and Height = 3m
Diagram:

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 × 5 × 3 + 2 × 4 × 3 + 5 × 4] m2

= (30 + 24 + 20) m2

= 74 m2

Cost of white-washing per m2 area = Rs 7.50

Cost of white-washing 74 m2 area = Rs (74 × 7.50)

= Rs 555

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