Question

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

Answer 1

the curved surface area of room + area of roof is required 
 curved surface area = 2 h ( l+b)
                                = 2 x 3 (4 + 5)
                                =  2 x 3 x 9
                                = 54 m ^2
 area of ceiling = 5 x 4
                         = 20 m ^2
required area= 54 + 20 
                     = 74 m^2
 white washing of wall = 74 x 7.5
                                    =Rs 555

Answer 2

Answer:

Here is the answer

Step-by-step explanation:

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