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 1.5 % grade, what is x in terms of y and z?
1% of x has .01x of fat, 2% has .02y of fat.. and .03 of fat..
total fat = .015..
.01x + .02y + .03z = .015
or.. x = 1.5-(2y+3z)
so.. x in terms of y and z is 2y + 3z.. constant can be ignored
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