Si vous êtes prêt pour un défi et que vous aimez les casse-têtes, vous découvrirez ici quelques supers énigmes mathématiques qui vous feront perdre la tête. Ces devinettes sont parfaites pour tester votre aptitude à résoudre des problèmes et pour bien entraîner votre cerveau. Que vous soyez un as des maths ou que vous vouliez simplement vous amuser, ces énigmes vous tiendront en haleine. Alors plongez sans attendre, et voyez combien vous pouvez en résoudre ! Animation créée par Sympa.
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Musique par Epidemic Sound https://www.epidemicsound.com
Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna
----------------------------------------------------------------------------------------
Nos réseaux sociaux :
Facebook: https://www.facebook.com/sympasympacom/
Instagram: https://www.instagram.com/sympa.officiel/
Stock de fichiers (photos, vidéos et autres):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
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Si tu en veux encore plus, fais un tour ici:
http://sympa-sympa.com
Category
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FunTranscript
00:00Nick and Oliver are twins and they want to organize a party for their birthday.
00:04They have a limited budget and therefore want to get as many delicious dishes as possible for the lowest possible price.
00:10Of course, they want pizzas. A 45.72 cm pizza costs 5 dollars, but on which planet?
00:17Ah, I forgot, we are in a riddle, while a 30.48 cm pizza costs 3 dollars.
00:23Oliver is a geometry enthusiast and he says that it is better to take a 45.72 cm pizza.
00:29Nick does not agree with this opinion. What is the biggest? A 45.72 cm pizza or two 30.48 cm pizzas?
00:47There are two answers to this question. From a geometric point of view, the surface of two 30.48 cm pizzas is equal to 1458.06 square centimeters.
00:58But that of a 45.72 cm pizza is 1638.71 square centimeters.
01:06From this point of view, it is better to take a 45.72 cm pizza.
01:11But hey, geometry and cooking are two completely different things.
01:15It is therefore the weight that counts. The higher it is, the more calories there are.
01:18So you know what to choose if you want there to be enough pizza for everyone.
01:22Nick is right.
01:24How to divide 5 pears between 5 people so that each of them receives a pear and at the same time there is a pear left in the basket?
01:41This time, it's very easy. No need to cut the pears.
01:45Just let one person take the pear directly into the basket.
01:50There are two ropes and each of them burns completely in an hour.
01:54There is also an ordinary matchbox.
01:57How can we measure exactly 45 minutes of time using only the objects that are given to us?
02:03However, there is a condition. The ropes cannot be cut.
02:07We set fire to a rope by its two ends. It is consumed in half an hour.
02:11At the same time, we set fire to the second rope by one of its ends.
02:15And half of the rope will burn in half an hour.
02:18When the first rope is consumed, we set fire to the second end of the second rope.
02:23It will be consumed by the two ends in 15 minutes.
02:26And the second rope will burn in 15 minutes.
02:30When the first rope is consumed, we set fire to the second end of the second rope.
02:35It will be consumed by the two ends in 15 minutes.
02:38In total, all this will take 45 minutes.
02:41The elevator for people goes up to the 5th floor twice as fast as the elevator for goods to the 3rd floor.
02:48Which elevator will arrive first?
02:50The freight elevator to the 3rd floor or the passenger elevator to the 5th floor,
02:53knowing that they left the first floor at the same time?
03:00Did you notice that the answer is hidden in the question?
03:03Yes, the elevator for people goes up faster.
03:08Four players sat down one evening and played all night until dawn.
03:12At the end, everyone counted the money they had in their wallet.
03:16It turns out that during the night, everyone won $100 and no one lost.
03:21How is this possible?
03:24And no, these people did not play cards.
03:27They are the musicians of a quatuor.
03:29After the concert, they received their cashier.
03:34Max must get up at 7 a.m. every day of the week to get to work on time.
03:39He has to go to work at 7 a.m.
03:41He has to go to work at 7 a.m.
03:43He has to go to work at 7 a.m.
03:45He has to go to work at 7 a.m.
03:47He has to go to work at 7 a.m.
03:49He has to go to work at 7 a.m.
03:51to get to work on time.
03:53Unfortunately, his alarm clock is not very accurate.
03:56After three days, he is 9 minutes late.
04:00Supposing that at 11 p.m. on Sunday
04:02Max checks his watch and sets the correct time.
04:06At what time would his alarm sound exactly on the Tuesday morning?
04:10At what time would his alarm sound exactly on the Tuesday morning?
04:13Camaraderie
04:16The alarm goes off 3 minutes a day, or 1 minute every 8 hours.
04:23From Sunday at 11pm to Tuesday at 5pm.
04:26There are 32 hours.
04:28The alarm will go off at 7.04pm, with a 4 minute delay.
04:36A merchant intends to visit 30 markets
04:39in order to find an appropriate place for his future transactions.
04:42He has in his hands 3 bags of apples, which he cannot leave at home.
04:46The merchant is forced to bring fruits with him.
04:49Unfortunately, all those who enter the market with food
04:53must pay a tax.
04:54One fruit per bag.
04:56How many apples will the merchant have after having visited all the markets,
04:59if he wishes to keep as many fruits as possible?
05:03There are a few conditions.
05:04First of all, keep in mind that at the beginning,
05:07the merchant had 90 fruits.
05:09Then, remember that each bag can hold more than 30 apples.
05:14Finally, the apples can be transferred from one bag to another.
05:26After visiting 10 markets,
05:28one of the merchant's bags will be completely empty.
05:31The second bag will be empty after having visited 15 additional markets.
05:35There will be only 5 markets left,
05:37and the merchant will leave 5 apples.
05:39He will have 25 fruits left,
05:41and he will probably not find an appropriate place to sell them.
05:45I think our friend would better start online trading.
05:504 couples of friends decided to go on a picnic together.
05:53Mary ate 3 sandwiches,
05:55Kathy 2,
05:56Lina 4,
05:57and Maria 1 sandwich.
06:00Jack ate as many sandwiches as his girlfriend Mary,
06:03Bob 2 times more than his girlfriend,
06:06Alex 3 times more,
06:08and Vincent 4 times more than his girlfriend.
06:11In total, they ate 32 sandwiches.
06:14What is the name of Alex's girlfriend?
06:28Maria.
06:29Jack ate 3 sandwiches,
06:31and his girlfriend is Mary.
06:33Bob ate 8 sandwiches,
06:35and his girlfriend is Lina.
06:37Vincent ate 8 sandwiches,
06:39while Kathy ate only 2.
06:41Alex ate 3 sandwiches,
06:43so his girlfriend is Maria.
06:48I can read your mind.
06:50If you don't believe me, think of a number.
06:52Make it simple,
06:53because you will have to do some math,
06:55and you will probably need a calculator to play this game.
07:00So you think of a number.
07:02Now, you multiply it by 3.
07:04It's done?
07:05Very good.
07:06Now, add 6.
07:08Then, you have to divide this number by 3.
07:11Now,
07:12subtract the number you thought of from the number obtained.
07:15Let me guess.
07:16You got 2, didn't you?
07:27There is no magic.
07:28It's just a great mathematical trick.
07:31It works with any number.
07:34The savannah is on fire.
07:353 lions and 3 zebras flee to save their lives.
07:38To escape the fire,
07:39they have to cross an infested river of crocodiles.
07:42Not far away,
07:43there is a raft that can carry 2 animals at a time.
07:46And there must be at least 1 lion or 1 zebra on board.
07:49In addition,
07:50lions cannot be more numerous than zebras on each side of the river,
07:54if only for a moment.
07:56It could have a small end.
07:58How can they all cross the river safely?
08:10First of all,
08:11a lion and a zebra have to cross the river.
08:13The lion stays on the other side,
08:15and the zebra leaves.
08:16For the second crossing,
08:17both lions take the raft,
08:19but only one of them stays on the other side.
08:22One of the lions returns.
08:23Then,
08:242 zebras cross the river.
08:26To return the raft,
08:27there must be a lion and a zebra on it.
08:30There is now a lion and a zebra on the other side.
08:33And 2 zebras and 2 lions on the river on fire.
08:36For the next crossing,
08:372 zebras take the raft.
08:39Now,
08:40all the zebras are safe,
08:42and the lion can bring his friends one by one.
08:45Mr. Daniels is a math teacher.
08:48He wants to simplify things for his students,
08:51and therefore offers them an idea.
08:53Anyone who can solve the problem he gives them
08:55will not have to take the exam at the end of the semester.
08:58The problem is as follows.
09:00How can the number 5 be half of 4?
09:03If you were Mr. Daniels' student,
09:05would you take the exam at the end of the semester?
09:17To solve this problem,
09:19you must use Roman numerals
09:22as we usually do.
09:24In Roman numerals,
09:254 corresponds to 4 and V to 5.
09:28And 5 is half of 4,
09:30according to this logic.
09:34Are you ready for a little riddle?
09:36Of course!
09:37It's an odd number,
09:38or odd in English.
09:39But if you remove a letter from it,
09:41it becomes even,
09:42or even in English.
09:43What is this number?
09:52It's 7,
09:53seven in English.
09:54Simply remove the S
09:56and you will get the word even.
09:58And here is a little more math in English.
10:01If you have always had trouble learning
10:03all the numbers of the number pi,
10:05forget it.
10:06There are thousands of billions,
10:08but there is a trick to remember at least 7.
10:11Simply say,
10:15There are 3 letters in how,
10:171 in i,
10:184 in wish,
10:191 in i,
10:205 in cool,
10:219 in calculate,
10:23and 2 in pi.
10:24You got 3,04592.
10:28Practical, isn't it?