Request your assistance with this GMAT Prep Quant Problem Source: GMAT Prep software Three Grades of Milk are 1%, 2% 3% fat by volume. If x gallons of 1%, y gallons of 2% and z gallons of 3% are mixed to give x+y+z gallons of 1.5%, what is x in terms of y and z. I used the plugging in method to solv...