You have two glasses of wine, one filled with red wine and the other filled with the same amount of white wine. You then take a teaspoon of red wine and pour it into the white wine. After a while, you take a teaspoon from the glass of white wine (which now contains a bit of red wine too) and pour it into the glass of red wine.
What's the result? Is there now more white wine in the red wine glass than red wine in the white wine glass? Or vice versa? Or are they equal?
