The three unknowns can be specified as follows:

Let x = the number of gallons of LimeOrange the company should make
Let y = the number of gallons of LimeLemon the company should make
Let z = the number of gallons of OrangeLemon the company should make

You can also list these in some other order, for instance:

Let x = the number of gallons of LimeLemon the company should make
Let y = the number of gallons of LimeOrange the company should make
Let z = the number of gallons of OrangeLemon the company should make.

NoteFor the rest of the problem, we shall assume the first ordering.

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