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A tank originally contains 100 gal of fresh water. then water containing 1/2 lb of slat per gallon is poured into the tank at a rate of 2 gal/min, and the mixture is allowed to leave at same rate. after 10 min the process is stopped, and fresh water is poured into the tank at a rate of 2 gal/min, with the mixture again leaving at the same rate. Find the amount salt in the tank at the end of an additional 10 min.

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