Subject: Okay, let's try a couple harder ones then...
Author:
Posted on: 2015-09-28 18:25:00 UTC
As so often occurs in puzzles, you find yourself shipwrecked on an island. The population of this island can be partitioned into two groups: knights and knaves. Knights answer all questions truthfully; knaves always lie. While wandering, you come upon a building with two doors, each guarded by one native islander. You know that one of the doors leads to a pile of treasure, and the other leads to a hungry, man-eating lion. You may ask a single yes/no question to one of the guards. Then you must select a door, and meet your fortune/death.
Challenge: If you know nothing about the distribution of the two islanders (maybe two knights, maybe two knaves, maybe one of each), what question do you ask?
Hard challenge: The island also contains some residents who reply at random. You happen upon three islanders, and know that there is one of each type (Knave, Knight, Random). You may ask three yes/no questions. (Each question can be addressed to only one of the islanders.) What do you ask in order to determine their identities?
I turn polar bears white
And I will make you cry.
I make guys have to urinate
And girls comb their hair.
I make celebrities look stupid
And normal people look like celebrities.
I turn pancakes brown
And make your champagne bubble.
If you squeeze me, I'll pop.
If you look at me, you'll pop.
Can you answer this riddle?