Logic Puzzles · Billy-B
Logic Puzzle #50
From Billy-B's legendary 1001 Puzzle Collection — preserved on Puzz.com since 1998.
Puzzle #50
You are in a room with 2 doors leading out. Behind 1 door is a coffer overflowing with jewels & gold, along with an exit. Behind the other door is an enormous, hungry lion that will pounce on anyone opening the door. You do not know which door leads to the treasure & exit, & which door leads to the lion. In the room you are in are 2 individuals. The first is a knight, who always tells the truth, & a knave, who always lies. Both of these individuals know what is behind each door. You do not know which individual is the knight, or which one is the knave. You may ask 1 of the individuals exactly 1 question. What should you ask in order to be certain that you will open the door with the coffer behind it, instead of the hungry lion?
Reveal Answer
There are 2 possible answers for this puzzle: Answer 1: You ask 1 of the individuals what the other 1 would say if you asked him or her which door you should open to get to the coffer — In this case, you would open the other door. Answer 2: You ask 1 of the individuals what the other 1 would say if you asked him or her which door is holding back the hungry lion. In this case, you would open this door.
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