How i find the best tricky way for solving the question of class 9^{th} of Surface areas and Volumes chapter of class 9^{th} give me the best and easy method for this question no.32 of exercise 13.1 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 ceiling at the rate of Rs 7.50 per m2.

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# 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 ceiling at the rate of Rs 7.50 per m2. Q.2

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Length (l) of room = 5m

Breadth (b) of room = 4m

Height (h) of room = 3m

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

Total area to be white washed = Area of walls + Area of ceiling of room

= 2lh+2bh+lb

= [2×5×3+2×4×3+5×4]

= (30+24+20)

= 74

Area = 74 m

^{2}Also,

Cost of white wash per m

^{2 }area = Rs.7.50 (Given)Cost of white washing 74 m

^{2 }area = Rs. (74×7.50)= Rs. 555