pull down to refresh
They know there are 200 people on the island, and each person knows the eye color of 199 of them.
reply
That's right
reply
I must not be understanding something! When the visitor goes there, no one is there because everyone has left.
reply
deleted by author
reply
ah! ok. If that's the case, I can only see one possibility: using water as a mirror! Ahhah
reply
Think about the case of just one person having blue eyes. What would they know and do?
reply
Do people know that 100 + 100 people are on the island? If they all get together in one place, everyone can tell what color their eyes are.