What do you understand by the term 'efficiency of a machine'?

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Solution

The ratio of the work done by the machine to the work done on the machine is called efficiency of a machine
$E f f i c i e n c y = \frac{O u t p u t e n e r g y}{I n p u t e n e r g y}$
[Work done by a machine is called the output energy and the work done on a machine is called the input energy.]

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