The perimeter of the floor of a room is 40m and its height is 3.5m. Find the area of the four walls of the room. Also find the cost of preparing the four walls at₹35per meter square.
A ladder leans against a wall making an angle of 45° with the ground. It reaches (√3-√2) m higher when the angle with the ground is made 60°.How long is the ladder?
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