下面是出国留学网小编为大家整理的2017GRE数学题目解析:前后相等量，欢迎大家阅读。 Three grades of milk are 1 percent, 2 percent, and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 3 percent grade are mixed to give x +...