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What is the efficiency of a heat engine with heat input 20 J and work output 5 J?

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What is the efficiency of a heat engine with heat input 20 J and work output 5 J?

(a) 25%

(b) 50%

(c) 75%

(d) 100%

I got this question in examination.

Question is taken from Efficiency in portion Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

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Right answer is (a) 25%

The explanation: Efficiency = 5/20*100 = 25%.

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