Question

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 m^2

Answer 1

Answer:

Rs 855

Step-by-step explanation:

Given dimensions of room:

         Length = 5m

         Breadth = 4m

         Height = 3m

Area of walls of room

= Lateral Surface Area of Cuboidal Room

= 2 ( lb +bh + hl )

= 2 ( 5 x 4 + 4 x 3 + 3 x 5 )

= 2 ( 20 + 12 + 15 )

= 2 ( 47 )

= 94 m²

Area of ceiling = l x b = 5 x 4 = 20 m²

Total area to be painted = Area of walls of room + Area of ceiling

                                         = 94 + 20

                                         = 114 m²

Given cost of whitewashing per m² = Rs 7.5

So, cost of whitewashing the entire room = 114 x 7.5 = Rs. 855

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