3. A 30-liter tank initially contains 10 liters of water in which 20 grams of salt are dissolved. Water enters the tank at a constant rate of 3 liters per minute. We also add salt to the tank at a constant rate of s grams per minute. The contents of the tank are well stirred, and salty water leaves the tank at a rate of I liter per minute. Determine s so that the tank, when full, will contain exactly 100 grams of salt,

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