Three grades of milk are 1%, 2%, 3% fat by volume. If x gallons of the 1%, y gallons of 2%, and z gallons of 3% are mixed to give x+y+z gallons of 1.5% grade, what is x in terms of y and z?
1.y+3z
2.(y+z)/4
3.2y+3z
4.3y+z
5.3y+4.5z
1.y+3z
2.(y+z)/4
3.2y+3z
4.3y+z
5.3y+4.5z
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