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Solve the following linear programming problem graphically : Find the maximum value of z = 105x+90y when x+y  50, 2x+y   80,   20,   0,   0

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Z(20,0) = 2100, Z(40,0) = 4200, Z(20,30) = 4800, Z(30,20) = 4950

  max.value of Z is 4950 when x = 30, y = 20

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