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okay today weamp;#39;re going to solve a mixing problem with first-order differential equations now letamp;#39;s say that I have a tank so I have a water tank thatamp;#39;s filled itamp;#39;s filled to 3000 liters letamp;#39;s say the solution is draining out of the tank straining out of the tank at 10 liters per minute but at the same time thereamp;#39;s a solution that is filling the tank also at 10 liters per minute all right so the solution level in the tank remains constant at 3,000 liters and that kind of makes sense because the flow rate of a solution into the tank is the same as the flow rate out of the tank so we have a solution than tank and itamp;#39;s a saltwater solution and I want to know what the amount of salt is in this tank at any given moment so letamp;#39;s start with say 15 kilos of salt 15 kilograms of salt in the tank we have a salty solution coming in and the concentration of the solution is coming in is 0.02 kilograms per liter so 20 grams per liter or