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three grades of milk are 1percent,2percent,3percent fat by v

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three grades of milk are 1percent,2percent,3percent fat by volume,if x gallon of 1 percent,y gallon of 2percent and z gallon of 3percent are mixed to give x+y+z gallons of a 1.5percent grade ,what is x in terms of y and
Question1:
X+2Y+3Z/X+Y+Z=3/2
你就可以推导出X=Y+3