A tank initially holds 100 gal of a brine solution containing 20 lb of salt. At t=0, fresh water is poured into the tank at the rate of 5 gal/min, while the well-stirred mixture leaves the tank at the same rate. Find the amount of salt in the tank at t= 5 mins. Select the correct response: None 9.45 lb. 15.58 lb. 12.13 Ib.

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