Question 667390
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Hi,
How much whipping Cream{{{highlight(x)}}} @ 9% Butterfat and Milk @ 2% Butterfat{{{highlight(35-x)}}} 
should be mixed to obtain 35 gallons of milk with 4% Butterfat?
Mixing Algebraically:
 .09x + .02(35-x) = .04*35
      .07x = .02*35
         {{{x = .02*35/.07 = (2/7)*35}}}= 10gal of the 9% and 25gal of the 2%
Note:
 Same amount of gallons on each side of the EQ