51.

546 17 9
                                    

On a remote (imaginary) island, there are 11 snakes and a single mouse. As you'd expect, snakes eat the mice. But contrary to what you'd expect, when a snake eats a mouse, it turns into one.

The snakes live by only two rules:

1. Don't get eaten.
2. Eat mice as long as rule #1 isn't violated.

How many snakes and mice will there be left on the island?


(This is a tricky one, so I put the answer is in the next chapter.)

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