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Tasks for logic (and not only) that will make you stir your brain
We at Bemorepanda have collected 50 such interesting logic tasks to warm up the mind, and they can be solved with pleasure by both adults and teenagers. An interesting and valuable pastime is guaranteed! Well, as always, you can see the correct answers under the picture to the question. Just try not to cheat, but honestly answer each question and check the correct answers solely for self-examination. Good luck!
1. A man drives his car to a hotel and tells the owner that he is bankrupt. Why?
Answer: He plays Monopoly.
2. There are two rooms isolated from each other. One has 3 light bulbs, the other has 3 switches. You are standing in a room with switches and you can go to a room with light bulbs only once. It is necessary to determine which light bulb is turned on by which switch ...
Answer: First you need to turn on the first switch, then wait a few minutes and turn it off. Next, you need to turn on the second switch.
Now you can go to the next room with light bulbs. You need to touch the light bulbs: the one that is not lit, but warm to the touch, is turned on by the first switch; the one that is lit is turned on by the second switch. And finally, that light bulb, which is not lit and cold to the touch, is turned on by the third switch.
3. You left your camp and walked south 3 miles. Then we turned east and walked another 3 miles. Then we turned north and walked another 3 miles, after which we came across a bear in his tent, who was eating your food! What color was the bear?
Answer: White. The only place where you can go 3 miles south, then 3 miles east, then 3 miles north and back to where you started is at the North Pole. Polar bears are the only bears that live at the North Pole and they are white.
4. A man looks at someone's photo. His friend asks who it is. The man replies, “I have no brothers or sisters. But this man's father is my father's son." Who was in the photo?
Answer: His son.
5. It wasn't easy to figure out who was who when the Brewer family got together. Uncle Nick Manny's brother's name is Mark. Lisa's grandparents are Nick's parents. Mark is married to Lisa's grandmother. The children of Dany Sandra's daughter are named Lisa and Alex. So who is Angela's brother-in-law?
Answer: Manny is Dany's brother-in-law.
6. Forrest ran away from home. He ran a little and turned left, ran the same distance and turned left again, ran the same distance and turned left again. When he returned home, there were two masked men there. Who were they?
Hint: This is a sports riddle.
Answer: Catcher and judge.
7. A man stands on one side of the river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet or using a bridge or boat. How did the dog do it?
Answer: It was winter, the river was frozen.
8. In 1990, the man was 15 years old. In 1995, the same man was 10 years old. How can it be?
Answer: The person was born in 2005 BC.
9. A sundial has the fewest moving parts of any clock. Who has the most?
Answer: An hourglass has thousands of grains of sand in it.
10. How did a football fan know before a game that the score would be 0-0?
Answer: Before the game the score is always 0:0.
11. Your parents have six sons, including you, and each son has one sister. How many people are in the family?
Answer: Nine - two parents, six sons and one daughter.
12. What is the next number in the row? 7645, 5764, 4576, …
The answer is 6457 because the last digit is moved forward to get the next number in the row.
13. The Arab sheikh is old and must leave his fortune to one of his two sons. He proposes that both sons race their camels and the camel that crosses the finish line LAST wins a fortune for its owner. During the race, the two brothers wander aimlessly for several days, not wanting to cross the finish line. In desperation, they seek advice from a wise man. He says something to them, then the brothers jump on the camels and rush to the finish line. What did the sage say?
Answer: The rules of the race were that the owner of the last camel to cross the finish line would win a fortune. The sage told them to just swap camels.
14. A man was walking in the rain. He was in the middle of nowhere. He had nowhere to hide. He came home all wet, but not a single hair on his head got wet. Why?
Answer: The man was bald.
15. Fourteen children in the class are girls. Eight children wear blue shirts. Two of the children are not wearing the blue shirt and they are boys. If five children are girls wearing blue shirts, how many children are in the class?
16. What number will you get if you multiply all the numbers on the phone's numeric keypad?
Answer: Zero, because any number multiplied by 0 will always be zero.
17. The person who does this does not need it; the person who buys it does not use it himself; the person who used it will never know about it. What's this?
18. You exit the maze and there are three doors in front of you. The door on the left leads to a lava pit. The door in the center leads to a room filled with deadly gas. The door on the right leads to a lion that hasn't eaten in three months. Which door do you choose?
Answer: the door is on the right. The lion, who had not eaten for three months, had already starved to death.
19. Where there are cities, but no houses; where there are forests but no trees; and there is water but no fish?
20. How many bricks does it take to build a brick building?
Answer: Only one - "last".
21. How 8 + 8 = 4?
Answer: If we consider it from the point of view of time. 8AM + 8AM = 4PM (4PM).
22. The water level in the reservoir is low but doubling daily. It takes 60 days to fill the tank. How long does it take for the tank to be half full?
Answer: 59 days. If the water level doubles every day, the reservoir on any given day was half as large as the day before. If the tank is full on the 60th day, it means that it was half full on the 59th day and not on the 30th.
23. The farmer needs to transport a fox, a chicken and a sack of grain across the river. The only way to cross the river is with a small boat that can only fit a farmer and one of the three items. Left unattended, the chicken will eat the grain, and the fox will eat the chicken. However, the fox will not try to eat the grain, and no animal will escape. How did the farmer move everything across the river?
Answer: The farmer must follow the following steps:
Send the chicken across the river.
Return to the empty boat.
Send grain across the river.
Bring back the chicken.
Send the fox across the river.
Return to the empty boat.
Send the chicken across the river.
24. When John was six years old, he drove a nail into his favorite tree to mark his height. Ten years later, at the age of sixteen, John returned to see how much taller the nail was. If a tree grew five centimeters every year, how much taller would a nail be?
Answer: The nail will be at the same height as trees grow from the top.
25. The red house is made of red bricks. The blue house is made of blue bricks. The yellow house is made of yellow bricks. What is a green house made of?
25. When Mitch was 6 years old, his younger sister Lila was six months old. If Mitch is 40 today, how old is Lila?
Answer: She is 37 years old.
26. A man describes his daughters, saying: “They are all blondes, except for two; all brunettes, except for two; and all red-haired except for two.” How many daughters does he have?
Answer: Three: blonde, brunette and redhead.
27. You have a 7 minute hourglass and an 11 minute hourglass. How do you time yourself to boil eggs in exactly 15 minutes?
Answer: To boil eggs in exactly 15 minutes, follow these four steps:
Turn over all the hourglasses when you start boiling the eggs.
After time runs out on the 7-minute hourglass, turn it over to start it again.
Four minutes later, when the 11-minute hourglass runs out, turn the 7-minute hourglass over again.
Wait for the 7 minute hourglass to run out, which will take another four minutes and give you exactly 15 minutes of boil time.
28. How far can a squirrel run in the forest?
Answer: Exactly to the middle of the forest. Then she will run from the forest.
29. There is a word in English in which the first two letters denote a man, the first three letters denote a woman, the first four denote a great man, and the whole word denotes a great woman. What's this word?
30. Guess the next letter in the row A D A E A Z A L A _
Answer: This is the letter "H". The thing is that the number of letters between the letter A and each subsequent letter in this sequence is always a prime number, starting from 3 (3, 5, 7, 11, 13 ...
31. Continue the number series: 1, 11, 21, 1211, 111221, 312211, ______?
There is a pattern in this sequence: each subsequent number describes one previous number.
So, in the first line we have one unit. Further, in the second line, the number 11 gives information that there is one unit in the previous line, we get 11. That is, one (1) unit (1). 21 in the third line shows that there are two ones in the previous line, that is, two (2) ones (1), we get 21. 1211 in the fourth line shows that there are one two and one unit in the previous line, that is, one (1 ) two (2) and one (1) one (1), we get 1211 and so on.
32. If the hand moves 1/60 of a degree every minute, how many degrees will it move in an hour?
Answer: One degree.
33. Four people arrive at a river with a narrow bridge that can only accommodate two of them at a time. It's night and they have one flashlight to use when crossing the bridge. Person A can cross the bridge in one minute, B in two minutes, C in five minutes, and D in eight minutes. When two people cross the bridge together, they must move at the pace of the slower person. Can they all cross the bridge in 15 minutes or less?
Answer: Yes, they will be able to cross the bridge in exactly 15 minutes. A group of four people must complete the following three steps:
First A and B cross the bridge and A returns the flashlight. It takes 3 minutes.
C and D then cross the bridge and B returns the flashlight. This will take another 10 minutes.
Finally, A and B walk across the bridge again. This will take another 2 minutes.
34. During what month do people sleep the least?
Answer: February (February has the fewest nights).
35. You put three matches on the table and then asked a friend to add two more matches to make eight. How can he do it?
Answer: From two matches, make the Roman numeral five and add it to three to get the Roman numeral eight.
36. Find a number less than 100 that increases by one-fifth of its value when its digits are reversed.
Answer: 45 (1/5 of 45 = 9, 9 + 45 = 54).
37. What three letters can scare away a thief? (A riddle for connoisseurs of the English language)
Answer: ICU, which in English will be read: "i see you", which in translation means: "I see you."
38. They take me out of the ground, drive me into a tree and use everything. What am I?
Answer: Pencil lead.
39. Is the capital of Kentucky pronounced Louisville or Louiesville?
Answer: Neither. The capital is Frankfort.
40. You are in a dark room with a candle, a wood stove and a gas lamp. You only have one match. So what do you fire up first?
41. Put a coin in an empty bottle and insert a cork into the neck. How can you get a coin out without removing the cork or breaking the bottle?
Answer: Push the cork into the bottle. Then shake out the coin.
42. Which letter comes next in the following sequence? D R M F S L T_
Answer: D. Each letter represents one note in the diatonic musical scale: Do, Re, Mi, Fa, Sol, La, Ti, Do.
43. I have a big piggy bank. Approximately how many coins can I put in until the piggy bank is empty?
Answer: Only one, after which it will no longer be empty.
44. What is unusual about the following English words: revive, banana, grammar, voodoo, assess, potato, dresser, uneven? (You don't need to know the translation to solve the problem!)
Answer: Take the first letter of each word and place it at the end. It will be pronounced exactly the same as in normal spelling.
45. How can a man who shaves his beard several times a day have a long beard?
Answer: He is a hairdresser.
46. What connects two people but concerns only one?
Answer: wedding ring.
47. Tell me, who walks on four legs in the morning, on two in the afternoon, and on three in the evening? What creature walks on four legs in the morning, two legs in the afternoon, and three legs in the evening?
Answer: Man. He crawls on all fours as a baby, walks on two legs when he is older, and then walks with a cane when he is old.
48. A girl has as many brothers as sisters, but each brother has half as many brothers as sisters. How many brothers and sisters are in the family?
Answer: Four sisters and three brothers.
49. The elevator is located on the first floor. There are five people in the elevator, including me. When the elevator reaches the first floor, one person exits and two people enter. The elevator goes up to the second floor, three people go out, five people go in. Then he goes up to the next floor, no one comes out, but 12 people come in. Halfway to the next floor, the elevator cable breaks and he falls. Everyone dies in the elevator except me. How did I survive?
Answer: I got off on the first floor.
50. Mr. Jenkins is trying to find a butler he can really trust. Of the four candidates, James, Hudson, Paul and Stephen, he knows that two are honest and the other two are compulsive liars. From what each of them says, can you tell which one is lying?
JAMES: "Neither Paul nor Hudson are telling the truth." HUDSON: "If Steven is a liar, then James can be trusted." PAUL: "If and only if James isn't an honest man, then Steven has a pretty vague attitude about the truth, too." STEVEN: "What Paul said is not true."
Answer: James and Paul are the two liars.