Question: A completely reversible heat engine operates with a source at 1500 R and a sink at 500 R. If the entropy of the sink increases

A completely reversible heat engine operates with a source at 1500 R and a sink at 500 R. If the entropy of the sink increases by 10 Btu/R, how much will the entropy of the source decrease? How much heat, in Btu, is transferred from the source?

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