1. The problem statement, all variables and given/known d Let's say there's a tank filled with a solution to its maximum volume V. Initially, the solution in V is water mixed with some amount of salt S. The objective is to add more of a solution also consisting of water and salt such that the amount of salt S is the same after the added solution is in the tank. Note: because the tank is filled to its maximum volume, as the solution is added, water of the same volume escapes from the tank. How would you go about solving this? 2. Relevant equations None, I confess I am stumped. 3. The attempt at a solution See above.