SOLUTION: How much extra-lean hamburger (12% fat) needs to be added to 339 lbs of regular hamburger (27% fat) to make a batch of lean meat (20% fat)??

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Question 1041589: How much extra-lean hamburger (12% fat) needs to be added to 339 lbs of regular hamburger (27% fat) to make a batch of lean meat (20% fat)??
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let n be the amount of extra-lean meat. Then:
.12n+.27(339)=.20(339+n)
91.53=.2n+67.8
.2n=23.73
n=118.65
118.65 lbs of extra-lean meat must be added to 339 lbs of regular meat to make 457.65 lbs of lean meat. ☺☺☺☺