There's A Riddle To Be Solved

The Professor Layton games on Nintendo DS have been a favorite of mine. But I have to admit, there's not much that will make you feel more dumb or more smug faster than that game. Some puzzles you reach through, feeling like a genius, then there's those others... Either way, there's Professor Layton to guide you along the way, here brilliantly recreated by Pedro Vezini. So anyway, there's three vessels, one 2/3 full, one 1/4 full and one 2/5 full, how are you going to....

Who has two thumbs ans solve Riddles?