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A tank contains 30 gallons of brine solution containing 10 lb of salt. Another brine solution...

A tank contains 30 gallons of brine solution containing 10 lb of salt. Another brine solution of concentration of 3 lb/gallon is poured into the tank at the rate of 2 gallons/min. The well stirred solution in the tank is drained out at the rate of 2 gallons/min. Let the amount of salt in the tank at time ? be ?(?).

Write the differential equation for A(t) and solve it.

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