We found that salt is added to the tank at a constant rate and it is removed from the tank at a rate dependent on the concentration of salt in the tank at time t, as follows. R. = 9 lb/min 2A(E) Ib/min Rout = 400 + t We were originally asked to find the total rate of change of salt in the tank as solution is added to the tank at one rate and removed from the tank at another rate. dA = (input rate of salt) - (output rate of salt) dt Therefore, a differential equation (in Ib/min) for the amount of salt A(t) (in Ib) in the tank at time t> 0 is the following. (Use A for A(t).) dA Ib/min dt

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