Use the two-stage method to solve.Find x1 ? 0, x2 ? 0, x3 ? 0 such that x1 + 2x2 + x3 ? 40 2x1 + x2 + x3 ? 26and z = 4x1 + x2 + 2x3 is maximized.
A. x2 = 20, x1 = 0, x3 = 0, z = 20
B. x3 = 40, x1 = 0, x2 = 0, z = 80
C. x1 = 30, x3 = 15, x2 = 0, z = 135
D. x1 = 40, x2 = 0, x3 = 0, z = 160
Answer: D
Mathematics
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