GMAT考题：Prep2007E1-PS-38

GMAT考题

题库 / Prep2007E1-PS-38

Three grades of milk are 1 percent, 2 percent, and 3percent fat by volume. If x gallons ofthe 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 3percent grade are mixed to give x + y + z gallons of a 1.5 percent grade, whatis x in terms of y and z ?

~$y+3z$~

~$\frac{\left ( y+z \right )}{4}$~

~$2y+3z$~

~$3y+z$~

~$3y+4.5z$~