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Calculate Efficiency of a system consisting of a cylinder sealed by a piston

A system consisting of a cylinder full of gas, sealed by a piston, is alternately loaded, heated, unloaded and then cooled back to it's original state.

If 211.2 Joules of work are done, and if 448.8 J of thermal energy are taken out or lost during cooling and other processes, then what is the efficiency of the system?

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