Your move!

[Trung Quốc]

If 6 glasses are arranged in a straight line and the first three are full, the last three are empty, what is the fewest number of glasses that can be moved so that the empty glasses and full glasses are alternate? (ie full, empty, full, empty,...):D

[Viet_us]

Only one move.

Lay ly thu 2 do vo ly thu 5 . Xong. :D :D :D

[Trung Quốc]

chém àh. :D Mới để lên là phá rồi. :p

[Tammy Nguyen]

Only 3,
Take the third pour into the sixth
Then take the second into the fourth
Then the 1st into second.