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The ratio of the height of a room to ...

The ratio of the height of a room to its semi-perimeter is 2 : 5. It costs Rs 260 to paper the walls of the room with paper 50 cm wide at Rs 2 per metre allowing an area of 15 sq. m for doors and windows. The height of the room is (a) 2.6m        (b) 3.9m      (c) 4m      (d) 4.2m

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