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A tank contains 420 liters of fluid in which 10 grams of salt is dissolved. Pure...

A tank contains 420 liters of fluid in which 10 grams of salt is dissolved. Pure water is then pumped into the tank at a rate of 6 L/min; the well-mixed solution is pumped out at the same rate. Find the number A(t) of grams of salt in the tank at time t.

A(t) =_______g

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