Puzzle 1 (pirates divide gold coins)—
Pirates divide gold coins
After five pirates robbed 100 gold coins, they discussed how to distribute them fairly. They agreed on the distribution principle is:
(1) Draw lots to determine each person's distribution sequence number (1, 2, 3, 4, 5);
(2) Pirates who draw lots. 1 Propose a distribution plan, and then five people will vote. If the plan is agreed by more than half of the people, it will be distributed according to his plan, otherwise 1 will be thrown into the sea to feed sharks;
(3) If 1 is thrown into the sea, No.2 puts forward the allocation plan, and then four people are left to vote. If and only if more than half of the people agree, they will be allocated according to his proposal, otherwise they will be thrown into the sea;
4 and so on.
Assuming that every pirate is extremely intelligent and rational, they can make strict logical reasoning and rationally judge their own gains and losses, that is, they can get the most gold coins on the premise of saving their lives. At the same time, assuming that the results of each round of voting can be implemented smoothly, what distribution scheme should the pirates who have drawn 1 put forward to avoid being thrown into the sea and get more gold coins?
Puzzle 2 (guessing cards)
Card guessing problem
Mr. S, Mr. P and Mr. Q know that there are 16 playing cards in the desk drawer: hearts A and Q, 4 spades J, 8, 4, 2, 7, 3 flowers K, Q, 5, 4 and 6 diamonds A and 5. Professor John chooses a card from 16 card, tells Mr. P the number of points in this card, and tells Mr. Q the color of this card. At this time, Professor John asked Mr. P and Mr. Q: Can you infer what this card is from the known points or colors? So, Mr. S heard the following conversation:
Mr. P: I don't know this card.
Mr q: I know you don't know this card.
Sir: Now I know this card.
Mr. Q: I know that, too.
After listening to the above conversation, Mr. S thought about it and correctly deduced what this card was.
Excuse me: What kind of card is this?
Problem 3 (burning rope problem)
Rope burning problem
It takes 1 hour to burn an uneven rope from beginning to end. Now several ropes are made of the same material. How to time an hour and fifteen minutes by burning rope?
Problem 4 (Table Tennis Problem)
Table tennis problem
Suppose there are 100 ping-pong balls arranged together, and two people take turns to put the balls in their pockets. The winner is the person who can get the100th table tennis. The condition is: the person who holds the ball must take at least 1 at a time and not more than 5 at most. Q: If you are the first person to take the ball, how many should you take? How can I take it in the future to ensure that you can get the100th table tennis?
Puzzle 5 (drinking soda)
The problem of drinking soda water
1 yuan a bottle of soda, drink two empty bottles for a bottle of soda, Q: You have 20 yuan money, how many bottles of soda can you drink at most?
Puzzle 6 (Divide gold bars)
Split gold bar
You let the workers work for you for 7 days, and the workers' reward is a gold bar. Gold bars are divided into seven consecutive parts. At the end of each day, you must give them some gold bars. If you are only allowed to break the gold bars twice, how can you pay the workers?
Puzzle 7 (Guigu Kaotu)
Guigu Kaotu
Sun Bin and Pang Juan are both disciples of Guiguzi; One day, the ghost came up with a problem: he chose two different integers from 2 to 99, told Sun the product and told Pang the sum.
Pang said: I'm not sure what these two numbers are, but I'm sure you don't know what these two numbers are either.
Sun said: I really didn't know at first, but after listening to your words, I can confirm these two figures now.
Pang said, since you put it that way, I know what these two numbers are.
What are these two numbers? Why?
Puzzle 8 (Puzzle)
The problem of scooping wine
It is said that someone gave the proprietress of a restaurant a difficult problem: this person knew that there were only two spoons in the shop, which could scoop 7 ounces of wine and 1 1 ounce of wine respectively, but forced the proprietress to sell him 2 ounces of wine. Smart proprietress is also unambiguous. She used these two spoons to hold the wine, turned it upside down and actually measured out 2 ounces of wine. Can you be smart?
Puzzle 9 (Five Prisoners)
Five prisoners together really stumped hundreds of millions of people's intelligence problems, which is an interview question for Microsoft.
Five prisoners, according to 1-5, caught mung beans in sacks containing 100 mung beans. It is stipulated that everyone should catch at least one, and those who catch at most and at least should be put to death. And they can't communicate with each other, but when they catch, they can find out the remaining number of beans. Ask them who has the best chance of survival.
Tip:
1, are very smart people.
Their principle is to save people first, and then kill more people.
3, 100 don't have to finish it all.
4. If there is any duplication, it will be regarded as the largest or smallest and executed together.
Puzzle 10 (King and Prophet)
Kings and prophets
Before going to the execution ground, the king said to the prophet, "Aren't you good at predicting?" Why can't you predict that you will be executed today? I'll give you a chance, and you can predict how I will execute you today. If your prediction is right, I will let you take poison to death; Otherwise, I will hang you. "
But the wise prophet's answer made it impossible for the king to execute him anyway.
How did he predict it?
Puzzle 1 1
Mr q plays games with Mr s and Mr p. Mr q wrote a number on two pieces of paper. These two numbers are both
Is a positive integer, and the difference is 1. He put a piece of paper on Mr. S's forehead and another on Mr. P's forehead. So,
Two people can only see the numbers on each other's foreheads.
Mr. Q kept asking: Can any of you guess the number on your head?
Mr. S said, "I can't guess."
Mr. P said, "I can't guess either."
Mr. S added, "I still can't guess."
Mr. P added, "I can't guess either."
Mr. s still can't guess; Mr. P can't guess either.
Mr. S and Mr. P guessed three times, but they didn't get it right.
However, by the fourth time, Mr. S shouted, "I know!" " "
Mr. P also shouted, "I know!" "
Q: What are the numbers on the heads of Mr. S and Mr. P?
Puzzle 12 (Who stole the captain's ring? )
The British cargo ship Elizabeth sailed for Japan for the first time. In the early morning, the cargo ship entered Japanese territorial waters. As soon as Captain David got up, he arranged the entrance and left a diamond ring in the captain's room.
15 minutes later, when he returned to his master's room, he found the ring missing. The captain immediately called the chief officer, sailors, flag bearers and chefs who were on duty at that time for questioning, but these crew members denied having been to the captain's room.
Everyone claimed that they were not at the scene.
Chief mate: "I broke my glasses. Go back to my room and change a pair. I must have been in my room then. "
Sailor: "I am busy salvaging the lifebuoy."
Flag bearer: "I hung the flag upside down and I was about to put it back."
Chef: "I'm repairing the refrigerator."
"Did the ring fly?" David, who usually likes detective stories, found out the liar according to their respective statements and mutual testimony. Facts have proved that this liar is a criminal!
Puzzle 13 (Find out the contaminated pills)
You have four jars full of pills, and each pill has a certain weight. The contaminated pill is the weight of the uncontaminated pill+1. Weighing only once, how to judge which can of medicine is contaminated?
Puzzle 14 (How many sick dogs ..? )
Fifty people each have a dog, and there must be sick dogs in fifty dogs.
Everyone can only directly observe and judge whether other people's dogs are sick, but can't directly judge whether their own dogs are sick (only by reasoning). Suppose it takes a whole day for a person to observe other people's dogs.
Everyone has the right to kill his sick dog, not to kill other people's dogs or to help others judge whether their dogs are sick.
On the first day, nothing happened
The next day, nothing happened.
On the third day, there was a burst of gunfire.
How many sick dogs are there?
Puzzle 15 (bacterial division)
A bacterium divides into two after 1 min, and divides into four again after 1 min. In this way, it takes 1 hour to put a bacterium in the bottle until it is full. If you put two such bacteria in the bottle from the beginning, how long will it take to fill the bottle?
Puzzle 16 (simple)
Someone invited A, B, C, D, E and F6 to attend a meeting. These six people are a bit strange, because they have many requirements. It is understood that:
1.a and B At least 1 people attended the meeting.
2. Two people from A, E and F3 attended the meeting.
B and C unanimously decided that either both of them would go or neither of them would go.
4. Only 1 of A and D attended the meeting.
5. Only C and D 1 will attend the meeting.
6. If D doesn't go, then E also decides not to go.
So how many people attended the meeting in the end?
17 (together)
The geography teacher drew pictures of Asia, Europe, America, Africa and Oceania and numbered them for five students to identify. There are different answers: A: 3 is Europe, 2 is America; B: 4 is Asia, 2 is Oceania; C: 1 is Asia and 5 is Africa; D: 4 is Africa, 3 is Oceania; E: 2 is Europe and 5 is America. As a result, everyone was only half right. What is the answer?
18 (troublesome)
1. On a street, there are five houses painted in five colors.
People from different countries live in every house.
Everyone drinks different drinks, smokes different brands of cigarettes and keeps different pets.
Please say according to the following tips: which country does people raise fish?
Tip:
1, the British live in a red house.
2. Swedes have dogs.
3. Danes drink tea.
The green house is on the left of the white house.
5. The owner of the green house drinks coffee.
6. People who smoke Pall Mall cigarettes keep birds.
7. The owner of the yellow house smokes Dunhill cigarettes.
People who live in the middle house drink milk.
9. The Norwegian lives in the first room.
10. People who smoke mixed cigarettes live next door to the cat owner.
1 1. Horse owners live next door to smokers on Dunhill Road.
12. People who smoke blue masters drink beer.
13, Germans smoke prince cigarettes.
14. The Norwegian lives next door to the blue house.
15. People who smoke mixed cigarettes have a neighbor who drinks water.
What's your answer?
19 (homicide)
The police found one person killed and five others with suspicious identities, namely ABCDE. The police questioned the five men separately.
One, I didn't kill him. I'm watching a movie with B.
B, A went out to see a movie for half an hour. I don't know what he did.
C and b like lying best.
D and c hold a grudge against the man who was killed. He has motive. I was about to go on a date when I passed the cinema and saw one coming out of it.
E, C and I are going to see a movie in the evening, but there are no tickets. I went to dinner and saw D making out with a beautiful woman. Ask C.
Who or who killed them?
20 (Beautiful Youth)
Of the three young people, Allen, Brian and Colin, only one is a beautiful young man.
Allen truthfully said:
(1) If I am not beautiful, I will fail the physics exam.
If I am beautiful, I will pass the chemistry exam.
Brian truthfully said:
If I am not beautiful, I won't pass the chemistry exam.
If I am beautiful, I will pass the physics exam.
Colin truthfully said:
If I am not beautiful, I won't pass the physics exam.
If I am beautiful, I will pass the physics exam.
meanwhile
That beautiful young man is the only one who can pass a course exam.
That beautiful young man is also the only one who can't pass another course exam.
Who is the beautiful young man among the three?
2 1 (favorite pervert killer test)
The first story: goose meat
A man was eating at a friend's house and asked his friend what meat to eat for this meal. When a friend said it was goose, he committed suicide by crying. Why?
The second story: jump on the train
A person went to see a doctor in a neighboring town by train, and all recovered after seeing it. On the way back, the train passed a tunnel, and the man jumped out of the car and committed suicide. Why?
The third story: aquatic plants
A man and his girlfriend went for a walk by the river. Suddenly, his girlfriend fell into the river. The man jumped into the water to look for it, but he couldn't find his girlfriend. He left here sadly. A few years later, he revisited his old place. At this time, he saw an old man fishing, but the fish caught by the old man didn't have any weeds. He asked the old man why there were no aquatic plants on the fish. The old man said: there have never been any aquatic plants in this river. Just then, the man suddenly jumped into the water and committed suicide. Why?
The fourth story: the story of the funeral
There are three people, mother and daughter. Mother died and the two sisters went to the funeral. My sister met a man at the funeral and fell in love with him at first sight. But the man disappeared after the funeral, and my sister couldn't find him anywhere. Later, a month later, my sister killed my sister. Why?
The fifth story: half a match
There was a man in the desert who died with his head down, with several luggage boxes scattered around him. The man was clutching half a match tightly and reasoning about how he died.
The sixth story: sawdust is everywhere.
There are two dwarfs in the circus. The blind dwarf is shorter than the other, and the circus only needs one dwarf. Of course, the shorter the dwarf in the circus, the better. The two dwarfs decided who was shorter than the tall man and then committed suicide. However, just the day before the date, the blind dwarf, that is, the short dwarf, committed suicide at home. In his home, only wooden furniture and sawdust were found. Ask him why he committed suicide.
The seventh story: knocking at the door in the middle of the night
A person lives in a hut on the top of the mountain. He heard a knock at the door at midnight. He opened the door, but no one was there, so he went to bed. After a while, there was another knock at the door, but no one answered, and so on several times. The next day, someone found a body at the foot of the mountain. The police came and took the people at the top of the mountain away. Why?
22 (The Story of Cells)
There is a cell with three prisoners. Because the glass is thick, three people can only see each other, but can't hear.
The voice of the other party. "
One day, the king thought of a way to put a hat on each of them and let them know the hat.
The children are either white or black, so they don't know what color their hats are. in?that?case
Next, the king announced the following two items:
1. Whoever can see the other two prisoners wearing white hats will be released;
Whoever knows that he is wearing a black hat will be released.
In fact, the king wears black hats for them. They can't see themselves because they are tied up. So the three of them
People stare at each other and don't talk. Soon, however, A, a conscientious man, decided by reasoning that he was wearing a black hat. you want
, how did he infer?
23 (Who is the prisoner)
One Sunday, the big pillar of the sixth grade was walking, and he saw two people walking side by side in front of him. A closer look reveals that both hands are handcuffed-it seems that a plainclothes criminal policeman caught the prisoner and was about to send him to a nearby police station. Now there is a problem.
Who is the criminal police and who is the prisoner?
Big pillar cocked his head and thought, you also think, which is the prisoner? Who is the criminal police team?
24 (not classic, not classic)
A fork in the road leads to an honest country and a lying country. Two people came, one from an honest country and the other from a lying country. An honest country always tells the truth, and a liar always tells lies. Now you are going to a country that lies, but you don't know which way to go. You need to ask these two people. How should I ask?
25 (crossing the river)
There is a river with hunters and wolves, a man with two children and a woman with two children.
If the hunter leaves, the wolf will eat everyone. If the man leaves, the woman strangles her two children.
If a woman leaves, there is a boat in the river that can only carry two people (additional conditions: only hunters, male or female)
Can row a boat). Q: How did these eight people cross the river (all on one side of the river, the wolf counts as one)?