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