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A brine solution of salt flows at a constant rate of 10 L/min into a large...

A brine solution of salt flows at a constant rate of 10 L/min into a large tank that initially held 100 L of pure water. The solution inside the tank is kept well stirred and flows out of the tank at a rate of 6 L/min. If the concentration of salt in the brine entering the tank is 4 kg/L, determine the mass of salt in the tank after t min.

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