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Think you’ve got what it takes to tackle some impossible riddles? Get ready to push your brain to its absolute limit! These mind-bending puzzles are designed to stump even the smartest problem solvers, but if you can crack them all, you’ll earn serious bragging rights.
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00:00Alex is a teenager living in New York City.
00:03His science teacher assigned him an interesting experiment,
00:07and Alex's mind was buzzing with possibilities.
00:10He ran home and found a huge watermelon in his mother's pantry.
00:15It was massive.
00:16When he weighed it, he found it was 100 pounds.
00:20He found out everything he needed about watermelons.
00:23But the most important information was that watermelons were generally 99% water.
00:31For the experiment, he left the fruit drying out in the sun for a few days.
00:35With the help of a trusty weighing scale,
00:38he discovered that the watermelon was now only 98% water.
00:42To get a 10 in his science experiment,
00:45he needed to figure out the total weight of the watermelon after losing 1% of its water.
00:51Can you help Alex out with this one?
01:06Here's the deal.
01:07At first glance, this riddle sounds like a piece of cake.
01:10You might have guessed that the watermelon now weighed 99 pounds.
01:14But that's actually not even close.
01:18Let's work out the answer together.
01:20To solve the riddle,
01:21Alex should start by thinking about the non-water part of the watermelon.
01:26If the watermelon was 100 pounds and 99% water,
01:30then 1% of it was the actual fruit.
01:34So, 1% of 100 pounds is 1 pound of the fruit.
01:39After drying, the watermelon is 98% water,
01:43which means the 1 pound of fruit now makes up 2% of the total weight.
01:48So, if 1 pound is 2% of the total weight,
01:51we can call that total weight W.
01:541 pound of 2% of W.
01:57Which is the same thing as saying that 1 pound equals 0.02 times W.
02:05To find W, we need to divide both sides by 0.02.
02:10So, if W equals 1 pound divided by 0.02,
02:16this means that W equals 50 pounds.
02:20Eureka!
02:21Alex had cracked the case.
02:22The once 100-pound watermelon now weighed 50 pounds.
02:29Cole invited his girlfriend Nikki over for a game night at his place.
02:34He told her he had a very difficult quiz prepared for her to solve.
02:40Cole showed her an empty triangular glass.
02:43He grabbed some orange juice and asked her when the glass would be closest to full.
02:49Measuring from the bottom of the glass to the top,
02:51Nikki had to guess the percentage of orange juice she'd have to pour
02:55in order for the triangular glass to be the closest as possible to half-full.
03:00If you had to guess without any calculations, what would you say?
03:14This is tricky, but let's check out the answer.
03:19Intuitively, you might have thought that the answer was 50% of the height of the glass,
03:23but that's wrong.
03:25When 50% of its height is filled, it means there's only 12.5% of juice inside the glass.
03:32In a similar way, if the triangular glass was filled up to 70% of its height,
03:38this would mean that it is only 34.3% full.
03:43The answer we're looking for is 80% of the height of the glass.
03:48To solve this riddle, we need to remember a basic geometry formula
03:52that says that the percentage of the volume is equal to the cube of the percentage of the height.
03:58So, if we're looking for 50% of the volume,
04:02we're searching for nearly 80% of the height to make it equal.
04:07Got it, genius?
04:09It was a sunny day in Los Angeles,
04:12and Harry and Maria were planning their wedding.
04:16Maria was very nervous because she couldn't figure out the seating chart for their wedding.
04:21They had a hundred guests and had to distribute them around.
04:25To lighten up the mood,
04:27Harry remembered an old, difficult-to-solve riddle
04:30that would definitely take Maria's mind off things.
04:33He asked her if she could figure out the mathematical equation needed
04:37to get the number 100 out of four nines.
04:42She could use the simple things such as addition, subtraction, division, and multiplication.
04:47The important part was that she got the number 100 out of it all.
04:51Can you help Maria out?
05:02The best way to solve these kinds of riddles is to start backwards.
05:06There are multiple ways to get the total of 100.
05:10Dare to join me in brainstorming the ways?
05:13You could simply add 99 plus 1 or 90 plus 9 plus 1.
05:18But that's not what the rules ask us to do.
05:21We need to use the number 9 four times.
05:24For example, 90 plus 9 times 9 divided by 9.
05:30Well, this won't get us to 100.
05:32But what about 99 plus 9 divided by 9?
05:38I know we have two 9s as one number, but that's okay by the rules.
05:42This way, you use all the four 9s you need to use,
05:45although you are combining two 9s into one number.
05:49But there are other possible answers.
05:52What do you say?
05:53Did you find any other answers to this crazy riddle?
05:58Once upon a time in a faraway kingdom,
06:01Queen Matilda needed to hire a worker for a seven-day project.
06:05The job was crucial, and she wanted to ensure the worker was paid daily.
06:11However, she could only pay him in gold bars,
06:13and she could only make a minimum of two cuts in her precious gold bar.
06:18Her plan was to pay him one-seventh of the bar per day.
06:23Can you figure out how she could manage to do this,
06:26following the conditions we showed?
06:37Well, Queen Matilda is a very intelligent woman,
06:41so this is how she worked it out.
06:43She made two precise cuts in the gold bar,
06:46creating three pieces.
06:48The first piece was one-seventh of the bar,
06:51the second piece was two-sevenths,
06:53and the third piece was four-sevenths.
06:57On the first day, the worker finished his shift,
07:00and Queen Matilda handed him the one-seventh piece.
07:04On the second day, she swapped the one-seventh piece
07:07for the two-sevenths piece,
07:09so the worker now had two-sevenths of the bar.
07:14By the third day,
07:15she gave him back the one-seventh piece,
07:18resulting in the worker having three-sevenths in total.
07:22On the fourth day,
07:24Queen Matilda took back the one-seventh and two-seventh pieces
07:27and handed over the larger four-sevenths piece.
07:31On the fifth day,
07:32the Queen handed over the one-seventh piece again,
07:35so the worker now had five-sevenths of the bar.
07:39On the sixth day,
07:40the Queen took back the one-seventh piece
07:42and gave him the two-seventh piece,
07:44resulting in the worker having six-sevenths of the bar.
07:48Finally, on the seventh day,
07:51the Queen handed over the last one-seventh piece,
07:54completing the full bar payment.
07:56And that's how Queen Matilda managed to pay her worker every day
08:00with just two cuts in the gold bar.
08:02Brilliant, right?
08:04Way to go, Queen M!
08:08Jake is on a bus,
08:10heading to visit his parents for the weekend.
08:13On another bus,
08:14coming from the opposite direction,
08:16is his brother, Max.
08:19Both buses are barreling down the road towards each other,
08:22each cruising along at 40 miles per hour.
08:26They started out at 40 miles apart.
08:28The brothers have been texting each other about their journeys,
08:31eager for the family reunion.
08:33As Jake stares out the window,
08:35he notices a little bird flitting around.
08:39His mind starts to wander
08:40and he imagines the bird flying back and forth between the two buses
08:44and wonders how many miles the birds would have flown back and forth
08:48until the buses meet each other.
08:50Can you help him out there?
09:01First, Jake figures out how long it will take for the buses to meet.
09:06Since both buses are driving at 40 miles per hour,
09:09their combined speed is 80 miles per hour,
09:12with the 40-mile distance between them,
09:14he divides the distance by their combined speed.
09:1840 divided by 80 equals 0.5 hours, or 30 minutes.
09:25Next, Jake turns his attention to the bird.
09:28He guesses the bird is flying at 50 miles per hour.
09:33Jake quickly multiplies the bird's speed
09:35by the time it takes for the buses to meet.
09:38This equals 25 minutes.
09:42So, by the time the buses meet,
09:44the little bird will have flown 25 miles.
09:47Yikes!
09:49Hey, hey!
09:50Are you ready to test your brain power
09:51and see how much of it you actually use?
09:54Then, let's start!
09:56There once was an evil king
09:58who loved himself so much,
09:59he'd always carry a pocket mirror
10:01to admire his own reflection.
10:03He wanted to have the largest
10:05and the most expensive castle in the whole world.
10:07He made workers build it day and night without a break.
10:11So, they decided to take revenge on him.
10:14Once the castle was ready,
10:15the king went in and found himself in a maze.
10:18There were three doors,
10:19and he had to pick one to get out.
10:22Behind the first door,
10:23there was a hungry monster
10:24that could take the life of anyone who looked at it.
10:27Behind the second door,
10:28there was a shaky bridge over a chasm
10:30that was easy to fall into.
10:32And the third door opened to a massive fire
10:35blocking the way.
10:36So, what should the king choose?
10:52The king should choose the first door.
10:54He can use that mirror he has
10:56to reflect the monster's gaze.
10:59Voila!
10:59The monster is gone,
11:00and the king can pass easily.
11:04Sandra has just moved into a new apartment,
11:07but she's in trouble already.
11:09She saw two people break into the apartment next door.
11:12She knew for sure she had just one neighbor,
11:15and he was a circus performer.
11:17Sandra called the police,
11:18but since none of the men had a key or an ID on them,
11:21the police couldn't help much.
11:23They decided to figure out which of the men was lying.
11:26Can you help them?
11:40Although there's plenty of sports gear in the room,
11:43the real clue is the flower on the clown's hat.
11:46The exact same flowers are growing in the apartment.
11:49So, he's the real owner.
11:52The police found a secret lab
11:54with a mad scientist living in it.
11:56He was working on a superpower potion
11:59that would help him take over the city.
12:01Somehow, he managed to escape from the lab,
12:03and now the police have to find him
12:06to prevent disaster.
12:07Do you have any ideas on how to do it?
12:23There are some flasks in the trash can.
12:25They must be the clue.
12:27And he must have left this weird gadget behind.
12:30Let's keep on searching.
12:31Here are some suspicious footprints.
12:33The mad scientist must have left them behind.
12:36Do you see him?
12:37There he is, hiding behind the car.
12:42Neil invited his best friends to his birthday party
12:45and ordered a cab for them
12:46so they wouldn't have to drive.
12:48Everyone had fun.
12:49But then it was time to open the gifts,
12:51and one of the boxes turned out to be empty.
12:54Someone must have stolen it.
12:57Sue said,
12:58I make more money than all of you together.
13:00Why would I steal that gift?
13:02Nikki said,
13:03I've just arrived,
13:04and you're blaming me for stealing something?
13:06Sorry for being late.
13:08Mimi explained,
13:09I haven't even seen that blue box
13:11with a golden ribbon before.
13:13Who's lying here?
13:27Nikki.
13:28Everyone arrived in one taxi.
13:30So how could he have been late?
13:36Liza is a secret agent,
13:38and today her mission is to discover
13:40some super important papers
13:41from a little house in a faraway village.
13:44She arrived there,
13:46made sure no one was watching,
13:47and was about to enter.
13:49But there was a combination lock on the door.
13:52Luckily, there was a note nearby.
13:54Can you help Liza figure out the code using the note?
14:11You have to count how many logs there are
14:14in each section of the house.
14:15The note has the order in which the numbers must be placed.
14:19So the code is 7834.
14:23Nick has just arrived home after a weekend
14:26at the polo club with his friends.
14:28Yikes!
14:29He just saw a burglar running out of his house.
14:31Nick tried to follow the stranger,
14:33but he was way faster,
14:35so Nick couldn't catch him.
14:36But he noticed the burglar was running
14:39towards the construction site nearby.
14:41He must be pretending to be a construction worker.
14:44Which of these guys is an imposter?
14:59Look, this guy is trying to saw through a beam.
15:02The guy on top will fall if he succeeds here.
15:04He must be the burglar.
15:08This family only seems normal.
15:10The dad is a real superhero.
15:13He can travel in time.
15:14He can fly, has super hearing,
15:16and always knows when someone is lying.
15:19It's cool, but not for his son.
15:21He has really bad grades at school
15:24and was grounded for the holidays.
15:25The boy really wants to go
15:27to his best friend's birthday party.
15:29How can he escape?
15:31He can tell his dad he has to be at school today.
15:34He can lock himself in and escape through the window.
15:37He can run away quietly while his dad is watching TV.
15:54His dad will know when the boy is lying,
15:57and his super hearing will help him notice
15:59if his son is trying to run away.
16:01So, the only way out is through the window.
16:06Someone stole a famous masterpiece from an art gallery.
16:10Three people were inside at the time of the crime.
16:12The head of the gallery, a maintenance person, and a visitor.
16:16The head of the gallery told the police,
16:18I was in my office signing papers.
16:20The maintenance person said,
16:22I was cleaning on the second floor
16:24and haven't noticed anything suspicious.
16:26The visitor said,
16:28I was in the modern art hall and was looking at exhibits.
16:31The police immediately guessed who was lying.
16:34Can you do the same?
16:48It was the maintenance person.
16:51The gallery doesn't have a second floor.
16:55In a big company, an important contract went missing.
16:59Three employees became the prime suspects,
17:01the manager, the secretary, and the analyst.
17:04Here's what they had to say.
17:06The manager said,
17:08I was busy at meetings with clients all day.
17:10The secretary insisted,
17:12I was filing mail in the archive.
17:14The analyst claimed,
17:16I was analyzing reports from the last quarter.
17:19The police quickly figured out who was lying.
17:22So, who stole the document and how did they know?
17:39It was the secretary.
17:41The company only updates the archive on Fridays.
17:44But this happened on a Wednesday.
17:46Busted!
17:49Someone tried to hack the security system
17:52of a top-secret research base.
17:54The base is really well-equipped
17:56with self-updating software and all the latest tech.
17:59Three team members fell under suspicion,
18:02the engineer, the guard, and the programmer.
18:05The engineer said,
18:06I was checking the base's power supply
18:08and everything was fine.
18:10The guard told the police,
18:11I was patrolling the area
18:13and everything was quiet.
18:15The programmer explained,
18:17I was updating the system's software.
18:19The police immediately knew
18:21who tried to hack the system.
18:23Can you guess who it was
18:24and how they figured it out?
18:38It was the programmer.
18:40The system updates automatically
18:42and doesn't need any help with it.
18:46An experimental chemistry kit
18:48went missing at school.
18:50And there were three main suspects.
18:51The chemistry teacher,
18:53a student,
18:54and the school principal.
18:56Here's what they said.
18:57The teacher,
18:58I was prepping for class.
19:00The student,
19:01I was reading a book in the library.
19:04Principal,
19:05I was reviewing documents about new supplies.
19:08The police immediately knew who was lying.
19:11So, who swiped the kit
19:13and how did they figure it out?
19:28It was the student.
19:30The library was closed for inventory
19:32on the day of the incident.
19:34So, there's no way
19:35they could have been there.
19:38You've got three boxes.
19:39One with just apples,
19:41one with just oranges,
19:43and one with a mix of both.
19:45The problem is that
19:46all the labels are wrong.
19:48How can you fix the labels
19:49by pulling out just one fruit?
19:51Think it over.
20:06So, here's the trick.
20:08Grab a fruit from the box labeled Mixed.
20:11Since all the labels are wrong,
20:12this box actually has
20:14either just apples
20:15or just oranges.
20:16Let's say you pull out an apple.
20:18It would mean that this box
20:20is actually the just apples box.
20:23Now, you've got two boxes left.
20:25The one labeled oranges
20:26can't just be oranges
20:28because it's mislabeled.
20:29And it can't be just apples
20:31because you've already found the apple box.
20:33So, it must be the mixed box.
20:36It means the last box,
20:38which was labeled apples,
20:39must be the just oranges box.
20:41And there you go.
20:43You've sorted out all the boxes.
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