This strange brain teaser has been circulating around our office recently. We’ve come up with a few different plausible solutions. Can you solve it?
1000 people live on a tropical paradise island. They are all really smart and always act with perfect rationality. They’re also mute- they can’t talk but they can hear and see each other with perfect clarity. There are no reflective surfaces on the island, which is convenient because the residents live by a peculiar rule: if you learn the color of your own eyes, then you must leave the island at midnight.
One day, a visitor comes to the island. Everyone on the island comes to greet the visitor. The visitor says to them, “I see someone with blue eyes,” then leaves the island. There are 500 residents with blue eyes and 500 with brown eyes. After the visitor leaves, who leaves the island and on which night?
Leave a comment with your response or questions! We will be responding with helpful hints as well.