10 snakes, 1 mouse.
(If there were only a single snake and mouse, the snake could eat the mouse, then turn into one, leaving a single mouse.
If there were two snakes and a single mouse, rule 2 would keep either of the snakes from eating the mouse to avoid being eaten themselves.
With three snakes and one mouse, one of the snakes could eat a mouse and be safe as a mouse thanks to rule 2.
This pattern continues. With an even number of snakes, nothing happens. With an odd number of snakes, one snake can eat the mouse.
Thus, with 11 snakes, one snake would eat the mouse, turn into one and leave 10 snakes and 1 mouse.)

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Ravenclaw Riddles
RandomSome riddles that are worthy of Ravenclaw Tower. I don't include the answers, so only enter if you can stand not knowing or are really good at riddles!