Question: In Problems, use the simplex method or Excel. Assume that all variables are nonnegative. Maximize f = 5x + 2y + z subject to 2x

In Problems, use the simplex method or Excel. Assume that all variables are nonnegative.

Maximize f = 5x + 2y + z subject to
                                 2x + 3y + z ≤ 30
                                 x - 2y + z ≥ 20
                                 2x + 5y + 2z ≥ 25

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