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The efficiency of the steam engine is 78.9%.
The efficiency of a machine is a measure of the useful work done by the machine as against the work input into the machine.
Work output of the steam engine = 225 K
Work input of the steam engine = 285 K
The efficiency of the machine = 225/275 × 100% = 78.9%
Therefore, the efficiency of the steam engine is 78.9%.
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