1) A large tom k initially contains 50 gallons of brine in which there is, dissolved 10 fb of salt. Brine containing 2db of dissolved salt per gallon flows into the tank at the rate of 5 gol / min. The mixture is kept uniformly concentrated by stirring, and the stirred mixture -sims- ultaneously flows out at the slower rate of 3 gal/min. How much salt is in the tank at timet > o?

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