Question

There is 2 dl (2 deciliters) of water in blue glass and 2 dl of wine in red glass. If we pour 0.5 dl of water from blue glass into the red glass and then we pour 0.5 dl of mixture from red glass into the blue glass, only one of the following statements is true. Which one?
1. There is more wine in blue glass than water in red glass
2. There is more water in red glass than wine in blue glass
3. There is the same amount of water in red glass and wine in blue glass
4. We can't make a conclusion if we don't know the specific weight of wine

I think that 4. statement is true.