rneve said – Wed, 08 Apr 2009 14:07:00 -0000 ( Link )
Three grades of milk are 1 percent,2 percent and 3 percent fat by volume. If x gallons of 1 percent grade , y gallons of 2 percent grade and z gallon of 3 percent grade are mixed x+y+z gallons of a 1.5 percent grade , what is x in terms of y and z? (1) y + 3z (2) ( y+z ) / 4 (3) 2y + 3z (4) 3y + z (5) 3y+ 4.5 z
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