Lathe - milling and grinding machine, Mechanical Engineering

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Define O.R. and what are the applications in Industry ?

A firm uses lathe, milling and Grinding machine to make two machine parts. The table below show the machining time required for each part, the machining time available on different machines and the profit on each machine part. Find the number of part-I and Part -II to be manufactured per week in order to maximize the profit:

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