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Find the area of the four walls of a ...

Find the area of the four walls of a room whose length is `6\ m ,` breadth `5\ m` and height `4\ m` . Also find the cost of white-washing the walls, if the rate of white washing is Rs. `5\ p e r\ s q u a r e\ m e t e rdot` (Doors, Windows and other opening ignored)

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