You are on a ship, over the side hangs a rope ladder with half meter rungs. The tide rises a half meter per hour. At the end of five hours, how much of the ladder will remain above the water assuming that nine rungs were above the water when the tide began to rise?
Hint: You are on a ship…
✨ Remember the tde Nine rungs will be above the water. As the tide rises, so will the ship and the ladder
L3 · logic
403
You are standing on the top one of two solid metal pillars
You are standing on the top one of two solid metal pillars. They are both exactly one kilometer apart from each other and they both stand one kilometer high. There is absolutely nothing around these pillars, but you have one small twig, one small rock and an unlimited supply of rope. Usuing only the materials named, how can you get from the top of the pillar that you are on to the top of the other pillar?
Hint: You are standing on the top one of two solid metal pillars…
✨ The twig and the rock were simply distractions used to divert you from the real answer
L3 · brain teaser
404
You are walking down a road and you encounter a fork in the road and you do not know the correct way
You are walking down a road and you encounter a fork in the road and you do not know the correct way to go. There are two men standing at the junction and both know the correct road. One man always lies, and the other man always tells the truth, but you do not know who is the liar and who is the one who tells the truth. You can only ask each man one question, but it must be the same question for both. What is the question that would allow you to get the information necessary to choose the correct path?
Hint: You are walking down a road and you encounter a fork in the road and you do not …
✨ You ask, “Which way would your companion say is the correct path?“
L3 · logic
405
You can carry it everywhere you go, and it does not get heavy
You have the misfortune to own an unreliable clock. This one loses exactly 24 minutes every hour. It is now showing 3:00am and you know that is was correct at midnight, when you set it. The clock stopped 1 hour ago, what is the correct time now?
Hint: You have the misfortune to own an unreliable clock…
✨ 6:00am: since the clock is losing 24 minutes every hour, for every real hour that has passed, the clock will only show 36 minutes
L3 · math
412
You have three stoves: a gas stove, a wood stove, and a coal stove, but only one match
You want to send a valuable object to a friend. You have a box which is more than large enough to contain the object. You have several locks with keys. The box has a locking ring which is more than large enough to have a lock attached. But your friend does not have the key to any lock that you have. How do you do it? Note that you cannot send a key in an unlocked box, since it might be copied.
Hint: You want to send a valuable object to a friend…
✨ Attach a lock to the ring. Send it to her. She attaches her own lock and sends it back. You remove your lock and send it back to her. She removes her lock