A Botanist Can Purchase Plant Food of Four Different Types

Multiple Choice

A botanist can purchase plant food of four different types, I, II, III, and IV. Each food comes in the same size bag, and the following table summarizes the number of grams of each of three nutrients that each bag contains. ​ ​
The botanist wants to use a food that has these nutrients in a different proportion and determines that he will need a total of of A, of B, and of C. Let x = Type I bags, y = Type II bags, z = Type III bags, and w = Type IV bags, where x, y, z, and w are non-negative amounts.
Find a general solution that will determine the number of bags of each type of food that should be ordered.
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A)
B)
C)
D)
E)