A tank initially holds 200 gal of a brine solution containing 50 lb of salt. At t = 0, fresh water is poured into the tank at the rate of 9 gal/min, while the well stirred mixture leaves the tank at the same rate. How much salt is in the tank after 20 min? 17.24 Ibs 32.43 Ibs 20.33 Ibs O 7.89 Ibbs

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