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Brilliant! I was trying to get there by using dQ/dt = [rate of inflow - rate of outflow] but couldn't quite figure out the right values for each in terms of Q. Kudos on your detailed method and thanks for your help. :)

Brine containing 2 grams of salt per litre runs into a vessel initially containing 100 litres of water and 25 grams of salt. If the brine enters at 5 litres/minute, the contents of the vessel are kept uniform by stirring and the mixture flows out at the same rate, show that if Q grams of salt...