Someone gave Winnie-the-Pooh a barrel of honey, placing it on the porch of his house. Pooh suspects that it was one of his friends: Piglet, Tigger or Eeyore. But how do you know? Each of them points to one of the other two. Only Piglet told the truth. If everyone pointed not to the one they point to, but to the second one, then Eeyore would be the only one who told the truth. Who gave the gift?

Leaflet #logic

One of the three friends gave honey to Rabbit in the same way. Piglet answered Rabbit's questions that it was Eeyore, and Rabbit forgot what Eeyore and Tigger said. Pooh took matters into his own hands and found out that only one of the three had told the truth, and he was the one who made the gift. Who gave the gift?

Leaflet #logic

Today, July 22, is Pi Approximation Day!

#celebration 🎉

Cowboy Joe bought several bottles of Coca-Cola for 40 cents each, several sandwiches for 24 cents and 2 steaks at the saloon. The bartender said it was $20.50. Cowboy Joe told the bartender everything he thought about his ability to count. Was the bartender really wrong?

Leaflet #logic

Three clown brothers Paul, François and Albert from the Fratellini family entered the arena wearing red, blue and green shirts. Their shoes were the same three colors. François's shoes and shirt were the same color. There was nothing red on Albert. Paul's shoes were green, but the shirt was not. What color shoes and shirt did Albert and François have?

Leaflet #logic

There are only two dollars in two wallets. At the same time, there is twice as much money in one wallet as in the other. How can this be?

Leaflet #difficult_situation

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☀️ Have a nice Sunday!

The castle is surrounded by a moat shaped like a rectangular frame. The width of the moat is the same everywhere. There are two boards whose lengths are equal to the width of the moat. Is it possible to cross the moat?

Leaflet #difficult_situation

Is it possible to load seven barrels of lemonade, seven empty barrels and seven half-filled barrels onto three trucks so that each truck has seven barrels and an equal amount of lemonade?

Leaflet #difficult_situation

Two trains are moving towards each other on the same railway line. A dead end departs from it, the length of which is less than the length of the train, but more than the length of one car. How do trains miss each other?

Leaflet #difficult_situation

Three kittens and three puppies ate twenty sausages. The red kitten ate the most, and the gray one ate the least. Could it be that the puppies ate no less sausages than the kittens?

Leaflet #difficult_situation

🎞 The Futurama Theorem

There are at least ten liters of water in the tank. Is it possible to collect six liters with a nine-liter bucket and a five-liter can?

Leaflet #difficult_situation

🎞 9.999... really is equal to 10

A peasant needs to ferry a wolf, a goat and cabbage across the river. But the boat is such that only a peasant can fit in it, and with him either only a wolf, or only a goat, or only cabbage. But if you leave a wolf with a goat without a peasant, then the wolf will eat a goat, if you leave a goat with cabbage, then the goat will eat cabbage. What to do?

Leaflet #difficult_situation

More about this river crossing puzzle

A woman picked apples in the garden. To get out of the garden, she had to go through four doors, each of which was guarded by a fierce guard who took away half of the apples. She brought home 10 apples. How many apples did the guards get?

Leaflet #reverse_course

📑 Science or prayer?

An alley of trees was planted in a row in the park. A year later, another one was planted between any two neighboring trees. A year later they did the same. There were 1197 trees. How many were there initially?

Leaflet #reverse_course

🎞 The Unbeatable Game from the 60s: Dr NIM

Two pirates were playing for gold coins. First, the first lost half of his coins and gave them to the second, then the second lost half of his coins to the first, then again the first lost half of the coins. As a result, the first turned out to have 15 coins, and the second 33. How many coins did each of the pirates have before the game started?

Leaflet #reverse_course

One lily bloomed on the lake. Every day the number of flowers on the lake doubled, and on the 20th day the whole lake was covered with flowers. On what day was the lake half covered with flowers?

Leaflet #reverse_course

🕊 Twitter

The following operations can be performed with numbers: multiply by two or randomly rearrange the numbers (you can't just put zero in the first place). Is it possible to get 74 out of 1 using such operations?

Leaflet #reverse_course

🥳 4th of August: John Venn's Birthday

English mathematician and logician John Venn was born in 1834. He is especially famous for introducing the "Venn diagrams" used in set theory and logic. Venn Diagram uses circles to visually and logically sort groups to illustrate their relationships to each other.

#celebration

All natural numbers from 1 to 1000 were written in the following order: first, the numbers whose sum of digits is 1 were written out in ascending order, then, also in ascending order, the numbers with the sum of digits 2, then the numbers whose sum of digits is 3, etc. In what place was the number 996?

Leaflet #reverse_course

In the classroom of the math club, all the children who went there were given chocolates. The first visitor was given one chocolate bar and a tenth of all the remaining ones, the second visitor was given two chocolates and a tenth of the remaining ones, ..., the ninth visitor was given nine chocolates and a tenth of the remaining ones. After that, Sheldon came running, but, unfortunately, the chocolates were already over. How many chocolates did the children get?

Leaflet #reverse_course