Please show the work!! A large tank contains 200 gallons of brine in which 100 lbs of salt are dissolved. Brine containing 1 lb/gal of salt is entering at a rate of 3 gal/min. The mixed solution flows out of the tank at a rate of 2 gal/min. If A(t) is the amount of salt in tank at the time t, write the differential equation for dA/dt?

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