Question 1041589
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. ☺☺☺☺