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Maximum of z = x + y with x + y <= 10, 5x + 3y >= 15, x <= 6: where does it occur

The same question, asked 2 times: 3 May 2023 S2, 9 May 2023 S1. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S2

    134
    The maximum value of Z=x+yZ=x+y, subjected to x+y≤10,  5x+3y≥15,  x≤6,  x,y≥0x+y\leq10,\;5x+3y\geq15,\;x\leq6,\;x,y\geq0

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  2. Question 2

    9 May 2023 S1

    126
    The maximum value of z=x+yz=x+y, subjected to x+y≤10x+y\leq10, 5x+3y≥155x+3y\geq15, x≤6x\leq6, x,y≥0x,y\geq0

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