I am having difficulty with the following question and do have the answer, but am uncertain as how to arrive there:

There are x gallons of 1% milk, y gallons of 2% milk, and z gallons of 3% milk. If one created the combination of x+y+Z to yield 1.5% milk, what's x in terms of y and z?

The answer happens to be y+3z

Could someone please help me in terms of the steps to get this answer (it seems simple, but I am having a mind block).

THANKS!

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