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Question -

Hameed has built a cubical water tank with lid for his house, with each other edge 1.5m long. He gets the outer surface of the tank excluding the base, covered with square tiles of side 25 cm. Find how much he would spend for the tiles, if the cost of tiles is тВ╣360 per dozen. [NCERT]



Answer -

Edge of cubical tank = 1.5 m
тИ┤ Area of 4 walls = 4 (side)┬▓ = 4(1.5)┬▓ m┬▓ = 4 x 225 = 9 m┬▓
Area of floor = (1.5)┬▓ = 2.25 m┬▓
тИ┤ Total surface area = 9 + 2.25 = 11.25 m┬▓
Edge of square tile = 25 m = 0.25 m┬▓
тИ┤ Area of 1 tile = (0.25)2 = .0625 m┬▓

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