Engine A outputs 20 J of work for every 100 J of heat removed from a hot reservoir. Engine B outputs 15 J of work for every 60 J of heat removed from…

Engine A outputs 20 J of work for every 100 J of heat removed from a hot reservoir.
Engine B outputs 15 J of work for every 60 J of heat removed from a hot reservoir.
Engine C expels 30 J of heat to its surroundings for every 10 J of work it outputs.
Engine D expels 48 J of heat to its surroundings for every 16 J of work it outputs.
Which engine is the least efficient?
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