Difficulty: Medium

 

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Escaping the Kingdom

Section: Brain Teasers Category: Insight
Difficulty:

A long time ago there was a kingdom, isolated from the world. There was only one way to and from the kingdom, namely through a long bridge. The king ordered the execution of anyone caught fleeing the kingdom on the bridge and the banishment of anyone caught sneaking into the kingdom.

The bridge was guarded by one person, who was taking a 10-minute break inside his cabin every round hour. Fifteen minutes were needed for a person to cross the bridge and yet, one woman managed to escape the kingdom. How did she do it?

Once the guard entered the cabin, the woman started crossing the bridge for 9 minutes, and then turned around and pretended to be going in the opposite direction for one more minute. When the guard caught her, she said she was trying to enter the kingdom, so he banished her away.

puzzle
Unknown Author November 1, 2023
3 Comments

Unconscious and Bleeding

Section: Brain Teasers Category: Lateral
Difficulty:

A man is found unconscious in front of a store at two in the morning. His head is bleeding and there is a brick laying next to him. When the police arrive, they carry the man to jail. Why did they arrest him?

The man was a burglar who tried to break the store’s glass with the brick. The glass turned out to be bullet proof, so the brick bounced back and hit him in the head, knocking him out.

puzzle
Unknown Author October 25, 2023
1 Comment

Dr. Riesen’s Rebuses 2

Section: Casual Puzzles Category: Rebus
Difficulty:

Can you figure out what common phrases these rebuses represent?

The answers are:

  1. A drop in the bucket
  2. First edition
  3. Kick the bucket
  4. Feeling under the weather
  5. Don’t cut corners
  6. Pillow talk
  7. Don’t cry over spilled milk
  8. Jump the gun
  9. Spill the beans
  10. A piece of cake
  11. Back to square one
  12. Hold your horses
  13. Catch my drift
  14. Let the cat out of the bag
  15. Face the music
  16. Barking at the wrong tree
puzzle
Guillaume Riesen October 22, 2023
0 Comments

A String Around a Rod

Section: Brain Teasers Category: Mathematics
Difficulty: Tags:

A string is wound around a circular rod with circumference 10 cm and length 30 cm. If the string goes around the rod exactly 4 times, what is its length?

Imagine the circular rod is actually a paper roll and the string is embedded inside the paper. When we unroll it, we get a paper rectangle 30cm×40cm with the string embedded along the diagonal. Using the Pythagorean theorem, we find that the length of the string is 50cm.

puzzle
Unknown Author October 7, 2023
0 Comments

An Ant’s Path

Section: Brain Teasers Category: Mathematics
Difficulty:

An ant is positioned at one of the vertices of a cube and wants to get to the opposite vertex. If the edges of the die have length 1, what is the shortest distance the ant needs to travel?

We unfold a cube to get a cross-shaped figure. Then, the problem is to find the shortest path between two points separated by a horizontal distance of 2 units and a vertical distance of 1 unit.

It is easy to see that the path in question is the one passing through the middle of the edge between the start and end points, and which has a distance of √5.

puzzle
Unknown Author September 19, 2023
5 Comments

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