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A 500-liter tank initially contains 200 liters of a liquid in which 150 g of salt...

A 500-liter tank initially contains 200 liters of a liquid in which 150 g of salt have been dissolved. Brine that has 5 g of salt per liter enters the tank at a rate of 15 L / min; the well mixed solution leaves the tank at a rate of 10 L / min.

Find the amount A (t) grams of salt in the tank at time t.

Determine the amount of salt in the tank when it is full.

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