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Maximise and minimize Z=12x+18y subject ...

Maximise and minimize `Z=12x+18y` subject to the constraints
`x+y le 10 , x -y le 0 , x+2yge 10 , x,y ge 0`

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The correct Answer is:
maximum value = 180 at (0,10) and manimum value = 90 at (0,5)
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