Differential Equations & Linear Algebra 21 4. A tank initially contains 100 liters of water with 200 grams of salt dissolved in the water. A brine solution with a salt concentration of 3 grams per liter is being pumped into the left side of the tank at a rate of 2 liters per minute, and the perfectly mixed solution is being pumped out of the right side of the tank at a rate of 4 liters per minute (see diagram to the right). Find the amount of salt in the TANK tank after t minutes. Differential Equations & Linear Algebra Section 1.6 23 Substitution Methods and Exact Equations - dy Example 1. Find the general solution to dx +e y/*

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