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  • Find the area of the four walls of a room whose length is 6m , breadth 5m and height 4m . also find the cost of white -washing the walls , if the rate of white washing is Rs 5 per square meter . (Doors , windows and other openings ignored.)

Find the area of the four walls of a room whose length is 6m , breadth 5m and height 4m . also find the cost of white -washing the walls , if the rate of white washing is Rs 5 per square meter . (Doors , windows and other openings ignored.)

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solution: Here , l=6m, b=5m  and h=4m

herefore             Area of the walls =2h(l+b)=left 2 imes4 imes(6+5) ight m^2=(8 imes11)m^2=88m^2

               cost of  white washing of 1 m^2 =Rs5

herefore           cost of the white washing of the walls  =Rs(5 imes88=)Rs 440

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Deependra Verma

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