Answer to Question #329484 in Differential Equations for mimi

Question

Consider a flask that contain 3 liters of salt water. Suppose that water containing 25 grams

per liters of salt is pumped into the flask at the rate of 2 liters per hour, and the mixture,

being steadily stirred, is pumped out of the flask at the same rate. Find a differential

equation satisfied by the amount of salt f(t) in the flask at time t.