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In a refrigerating system work done per kg of air is 20 kcal and heat extracted per kg of air is 25 kcal. The quantity of refrigerant used is 10 kg. The coefficient of performance of the system would be

[A].	0.8	[B].	8
[C].	1.25	[D].	12.5
[E].	5

Answer: Option C

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