General Allocation Problems

A feed mix company makes three kinds of feeds having the following compositions: Suppose the company can sell these for a profit of $27, $21, and $14 per ton; assume that the company has on hand 1800 tons of Corn, 1000 tons of oats, and 600 tons of wheat. If all the production can be sold and the blending process is equally expensive for each blend, how many tons of each feed should be produced to maximize gross revenue? Please set-up and eventually solve with TORA and AMPL. Suppose that management decides it wants to produce at least three times as much of mix #3 as of mix #2, and at least 3 times of mix #2 as of mix #1. Please set-up and eventually solve with TORA or AMPL