A tank initially contains 10 L of a salt solution.Water flows into the tank at a rate of 3 L/min, and the wellstirred mixture flows out at a rate of 2 L/min. After 5 min, the concentration of salt in the tank is 0.2 g/L. Find:
(a) The amount of salt in the tank initially.
(b) The volume of solution in the tank when the concentration of salt is 0.1 g/L.
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