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?
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