Three grades of milk are 1%, 2% and 3% fat by volume. If x gallons of 1%, y gallons of 2% and z gallons of 3% are mixed together to give x+y+z gallons of a 1.5%, what is x in terms of y and z?
My idea was:
(x+2y+3z)/(x+y+z) = 1.5
from here on I have no idea how to get x to one side...
Just cross multiply and you get the answer .
x = y+3z
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