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I did the working process backwards, i figured out most things but i dont understand how initially t=0 Q=100 so the c = 100/3 ln(300)

This is annoying me because partially, the example i can find disincludes some factors in the actual question im doing, can any of you explain me how you get the intial conditions for: "A tank contains 100L of brine whose concentration is 3grams/litre. Three litres of brine whos concentration...