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  1. The cost of papering the four walls of a room at 70 paise/sq. m is Rs 157.50. The height of the room is 5 m. Find the length and breadth of the room if they are in the ratio 4 : 1.

Options:
A .  20 m , 4.5 m
B .  30 m , 4.5 m
C .  18 m , 4.5 m
D .  15 m , 4.5 m
Answer: Option C

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