Crowns and Lions
Split the grid into four identical regions, such that each region contains a lion and a crown.
SOLUTION
The solution is shown below.
Category: Puzzles
Henry Ernest Dudeney (1857 – 1930) was an English author and mathematician who specialized in logic puzzles and mathematical games. He is known as one of the country's foremost creators of mathematical puzzles.
A Cabin in Colorado
A man is sitting in his cabin in Colorado. Three hours later he gets out of his cabin in Texas. How is this possible?
SOLUTION
The man is a pilot and he is sitting in his airplane cabin.
Hidden Objects Easter
Can you find the objects hidden in the three pictures below? You are looking for:
- 1 egg among the flowers
- 1 Easter egg among the flowers
- 1 bunny among the Easter eggs
SOLUTION
The solution is shown below.
Hand Maze
Can you find the way between the two red regions in this hand maze?
SOLUTION
The solution is shown below.
Inside the Möbius Strip
Can you pass through this maze, inspired by the Möbius strip?
SOLUTION
The solution is shown below.
One to One Hundred
99 unique numbers between 1 and 100 are listed one by one, with 5 seconds pause between every two consecutive numbers. If you are not allowed to take any notes, what is the best way to figure out which is the missing number?
SOLUTION
Keep up adding the given numbers and remember only the last two digits of the sum. In the end, if the result is less than 50, subtract it from 50. If the result is larger than 50, subtract it from 150. This method works because the sum of all numbers from 1 to 100 is 5050, so if you know the sum of all the listed numbers, you will know the missing number as well.
Two Lost Cards in a Deck
Below you can read the steps of a magic trick, as well as a video of its live performance. Your goal is to figure out how the trick is done, then perform it for your friends and challenge them to figure out the trick themselves.
- Take out from your pocket a deck of cards, which is visibly shuffled.
- Ask your first assistant to cut the deck, then take the top card from the bottom pile of cards and memorize it.
- Ask your second assistant to take the next card from the bottom pile and memorize it.
- Ask your first assistant to return his card back on the top of the bottom pile, then ask your second assistant to do the same.
- Place the two piles of cards on top of each other and cut the deck multiple times.
- Split the deck into two piles of cards, dealing consecutively one card on the left, then one card on the right, and so on, until you run out of cards.
- Take one of the two piles of cards, look at it, and guess correctly what cards were chosen by your assistants.
How does the magic trick work? Below you can see a live performance of the magic trick from Penn and Teller’s show Fool Us.
SOLUTION
The secret of the trick is to memorize the group of cards which are located in even positions and the group of cards which are located in odd positions in the original deck. An easy way for doing this is to split the cards into two groups, such that the cards in the first group are only spades and diamonds, and the cards in the second group are only clubs and hearts.
When the two assistants pick their cards and then return them back into the deck, the order of the cards is reversed. When you split the original deck into two piles (even after cutting it several times), each of the piles will contain a card which should not be there. For example, the group of spades and diamonds will contain one clubs card, and the group of clubs and hearts will contain one diamonds card. These two cards are the ones which were picked by the assistants.
Under Water
The diving bell that Slylock Fox and Max Mouse are using has snapped its chain. A rescue team can reach Slylock and Max within 20 minutes, but there
SOLUTION
He will use the lug wrench to remove the sunken car’s tires and release their air into the diving bell.
Handshakes at a Party
100 guests go to a party and some of them shake hands with each other. Show that there are two guests who handshake the same number of people.
SOLUTION
Each of the people at the party has shaken hands between 0 and 99 times. However, if someone has shaken hands 0 times (with nobody), it is impossible that another one has shaken hands 99 times (with everybody). Therefore there are at most 98 different options for the number of handshakes at the party, and thus two of the guests have shaken hands the same number of times.
5 Lines With 4 Points
On the image below you can see 11 points in the plane placed in such
SOLUTION
Simply draw a pentagon.
