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Get ready to be puzzled and entertained!
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00:00Greetings to the best Brightside Detectives. Have you prepared your magnifying glasses? Then let's start.
00:08A man was trapped in a dark room. His only source of light was a candle.
00:13There were three doors leading out of the room. Behind one of them, there was a tunnel that could help
00:19him escape.
00:20Behind the other two doors, there was a concrete wall.
00:23The man had a key that could open any of the doors, but he could only use it once.
00:28Still, the man managed to get away. How did he do this?
00:41He brought the candle to each of the keyholes in turn. Near the door with the tunnel, the flame started
00:47to flicker.
00:51Imagine that you're stuck on the top floor of a 30-story building and there are no stairs you could
00:56take.
00:57Your only option is to use an elevator.
01:00There are four elevators in front of you, but the first one is swarming with extremely venomous spiders.
01:06In the second elevator, ah, look, there's no elevator.
01:10You can only see an empty shaft.
01:13The third elevator is filled with toxic liquid.
01:16As for the fourth elevator, a furious hungry tiger is inside.
01:20Uh-oh.
01:20It seems like a no-win situation, but you have to find a way out.
01:25Which elevator?
01:35You should choose elevator number three.
01:38As soon as the doors of this elevator open, all the liquid will pour out.
01:42And the only thing you'll need to do is to step far away enough not to have your shoes soaked.
01:49Now, let's check how attentive you are.
01:52Try to figure out which rabbit doesn't have a twin.
01:56A small hint.
01:57Pay attention to the matching patterns on their ears, bellies, and cute little faces.
02:11Yep, that's the one we're looking for.
02:13Unlike others, it has darker spots around its nose and on its ears.
02:18And here's a bunch of kitties with their tails sticking up.
02:22A perfect hiding spot for a little bunny.
02:25Can you find it?
02:35This white rabbit is hiding literally in plain sight.
02:40Damien has bought a new keyboard.
02:43But apparently, the seller fooled the guy and gave him a fake one.
02:47Can you find the proof?
02:57The keyboard has no fives, but there are two fours.
03:04Someone hid a soccer ball in this crowd of happy pandas.
03:08Can you spot it?
03:18Right, here it is.
03:20So easy to miss.
03:23A dog has run away from its master.
03:26It's now hiding somewhere among all these bulls.
03:29Can you help the worried owner find his pooch?
03:41Right, here it is.
03:42Similar but not the same.
03:47Look at these two ladies.
03:49Which one seems suspicious?
03:59It's the woman on the right.
04:01Her reflection is all wrong.
04:03She's probably not human.
04:07All these people seem to be taking a shower.
04:09But which one is doing something wrong?
04:21The guy on the left, he probably just pretends to be taking a shower.
04:25But the water isn't running.
04:28Look at these people dancing at a costume party attentively.
04:32You need to figure out who is a werewolf.
04:43It's that guy in the corner.
04:45He's wearing a human mask.
04:47But his thick hair is peeking from underneath the mask.
04:51All of these people look well off, wearing some jewelry and nice outfits.
04:56But only one of them is indeed rich.
05:07It's that guy in a t-shirt.
05:09While he's focusing on his work, his bodyguards are waiting for him.
05:13Look at how attentively they're watching him and their surroundings.
05:18Which of these girls relaxing near the swimming pool is married?
05:32This girl doesn't have a ring.
05:33But she's wearing it on another finger.
05:35The second girl doesn't have a ring whatsoever.
05:38It's the third girl that's married.
05:40She must have taken her ring off before going for a swim.
05:43Even though she isn't wearing it,
05:45there's a visible tan line on her ring finger.
05:49In one magic country,
05:51all animals are intelligent and rational.
05:54In one clearing,
05:55there are ten lions and a sheep.
05:57Your task is to watch them
05:59and make sure the lions don't harm the sheep.
06:01If you get distracted,
06:03a lion can eat a sheep.
06:05But what the lions don't know
06:07is that if one of them does this,
06:09it will turn into a sheep too.
06:11In this case,
06:12the rest of the lions will probably eat it as well.
06:14If you leave this lovely company alone for some time,
06:18how many lions and sheep will you find when you come back?
06:31When you return,
06:32most likely,
06:33there will be nine lions and one sheep.
06:35The main thing here is that all the animals are rational.
06:39Once the lion eats the sheep
06:40and turns into a sheep itself,
06:42the rest of the lions will understand the consequences
06:45and prefer to stay in the safety of their natural form.
06:49Oliver got a present for his girlfriend, Victoria.
06:52It was a new smartphone she'd wanted for ages,
06:55but Oliver didn't give it to her right away.
06:58Instead,
06:59he put it into a box.
07:01Victoria had to figure out
07:03in which of these three boxes the gadget was.
07:05Each box had a note.
07:07It's in here.
07:09Your present isn't here.
07:11It's not in the first box.
07:14Only one of these notes told the truth.
07:16Where is the smartphone?
07:27If it's in the first box,
07:29it'll mean that claims one and two are correct,
07:32which contradicts the conditions of the riddle.
07:34If the phone is in the third box,
07:37then both claims two and three will be true.
07:40But if the device is in the second box,
07:43note number three will be the only truthful statement.
07:47Mr. Smart's wife went missing.
07:50A detective came to investigate this case.
07:52Mr. Smart told her the following.
07:55The last time I saw my wife was in the morning.
07:58She was having breakfast.
07:59When I returned home at 6 p.m.,
08:01her breakfast was still on the table,
08:03but she had disappeared.
08:05After hearing the man's story,
08:06the detective immediately arrested Mr. Smart.
08:09Why did she do so?
08:20When the detective arrived at the Smart's house,
08:22the breakfast on the table was still steaming.
08:25This means that Mr. Smart had set up the scene
08:28right before he called the police.
08:32Once, Mr. Blue, Mr. Red, and Mr. White meet for dinner.
08:36When they take off their jackets,
08:38Mr. Blue draws their attention to the fact
08:40that each of them is wearing a shirt
08:42different from their surname.
08:44The man in a white shirt looks surprised and says,
08:48Yeah, Mr. Blue, you're right.
08:49Can you figure out which shirt each man is wearing?
09:02So, let's think logically.
09:05Mr. Blue can be wearing only a white or red shirt.
09:08But we know for sure that another man is dressed in white.
09:12This means that Mr. Blue can only be in a red shirt.
09:16Mr. White could be dressed in a blue or red shirt,
09:19but the red one is already taken by Mr. Blue.
09:22So, we can logically conclude that Mr. White is wearing blue.
09:27And, as a result, this leaves us with Mr. Red
09:30dressed in a white shirt.
09:34Liza was a popular guitar player in a rock band.
09:37On Friday, the band was going to have a big gig.
09:40Liza's bandmates were waiting for her,
09:43but the girl was very late.
09:44Eventually, she showed up.
09:46But it wasn't Liza.
09:48It was her twin sister, Alice.
09:50She was envious of Liza.
09:52So, she locked her sister in the room,
09:55took her clothes and the guitar,
09:57and pretended to be a band member.
09:59But as soon as the musicians saw fake Liza,
10:02they immediately knew she wasn't their bandmate.
10:05How did they understand?
10:16Look how long the girl's nails are.
10:18You need to have short nails to play the guitar.
10:22A man came to a fruit market to sell watermelons.
10:25After he sold half of them and half of a watermelon,
10:28he saw he had one watermelon left.
10:31How many watermelons did he bring to the market?
10:43He came there with three watermelons.
10:50We're going to start out easy.
10:52You'll have 10 seconds to make number 7 even.
11:08This is not about math, actually.
11:11To make 7 even,
11:12you only have to take away the letter S
11:15at the beginning of the word.
11:19Okay, the next one is a bit trickier.
11:22Two 4's skipped dinner.
11:23How come?
11:38Because they're 8.
11:39I mean, 8.
11:41Yeah, these are homophones.
11:44The last riddle to warm you up.
11:46So what numbers are always on the moon?
12:02Roman numbers.
12:03Roman.
12:04Sorry, I couldn't resist the pun.
12:07On to more serious stuff.
12:11Let's test your logic, shall we?
12:13Take a look at this number sequence.
12:154, 6, 9, 6, 14, 6.
12:20As you see, one digit is missing.
12:24Which digit logically follows this series?
12:276, 17, 19, 21.
12:43If you pick the number 19, congratulations.
12:47You see, each time 5 gets added.
12:504 plus 5 equals 9.
12:529 plus 5 equals 14.
12:55And 14 plus 5 equals 19.
12:58Woohoo!
12:59The number 6 in between other digits stay the same.
13:02They do not change and act more like a frame for all the other digits.
13:09Now, take a look at this picture.
13:12How many triangles are there?
13:14Again, I'm going to help you a bit.
13:16So, it is 7, 8, 12, 18.
13:34The correct answer is 18.
13:36Look, here's how you should count.
13:38You have really small triangles on top and bigger ones.
13:44Okay, this one is not a riddle, but a quick magic trick to make you the fastest in your class.
13:50If you need to multiply some numbers from 1 to 10 by 9, you don't need anything but your hands.
13:57Place both palms before you and assign each finger a number, just like you can see it on the screen.
14:03If you need to multiply 3 by 9, bend finger number 3.
14:09On the right, you still have 7 unbent fingers.
14:12That's the first part of the answer.
14:15On the left, only 2.
14:17That's the second part.
14:18Voila!
14:199 times 3 equals 27.
14:25Hey, are you a discount hunter?
14:27If so, you gotta be quick on counting how much money you're gonna save.
14:31To calculate the discount you're gonna get during a sale without a calculator, use this trick.
14:37For instance, to find out what 5% of 235 is, follow this method.
14:43Step 1.
14:44You get 10% of the whole.
14:46To do that, just move the decimal point over by one place.
14:50235 becomes 23.5.
14:54Step 2.
14:55Keep in mind that 5% is half of 10%.
14:59Divide 23.5 by half.
15:02The answer is 11.75.
15:05That is also the answer to the original equation.
15:11Alright, this one is just more math magic.
15:15Right, so A% of B equals B% of A.
15:20Like, 9% of 30 is equal to 30% of 9.
15:26That's it.
15:27This trick was really short.
15:29I mean, you will probably thank me one day for that when you use it in an exam.
15:35A math trick to save your party.
15:38What's bigger?
15:39One 18-inch pizza or two 12-inch?
15:42You've got 10 seconds to think.
15:57Well, there are two answers to that.
16:00Geometry claims the area of two 12-inch pizzas is equal to 226 square inches.
16:06But the 18-inch pizza is 254 square inches.
16:10Well, from this point of view, you'd rather grab an 18-inch one.
16:14But hey, geometry and cooking are two completely different things.
16:18So, it's the weight that matters here.
16:21The more the weight is, the more calories there are.
16:24So you know what to choose, and there will be enough pizza for everyone.
16:30All right, let's have a short pause and have another fun riddle.
16:34So, number 4 wanted to go to a nightclub.
16:36But the security didn't let it in.
16:38How come?
16:52Because it's two squared.
16:54I mean, two squared.
16:56You get the point.
16:59Next one here.
17:00This is Triangle Jack.
17:02And in the geometry world, everyone says he's rude.
17:06What can Rude Jack say to Circle Jerry?
17:22Jerry, you're pointless.
17:24Yeah, that doesn't sound quite polite, but it's just geometry.
17:26No offense.
17:30Hey, do you know what snake has the most mathematical name?
17:46It's Python.
17:47It's Python.
17:51Back to more serious stuff.
17:53Let's assume you need to prove 6 plus 7 equals 1.
17:57Can you do that?
18:11Yep, it is indeed correct, but you've got to take a look at that from another perspective.
18:16Let's say these are not numbers, but hours.
18:19Do you see what I'm driving at?
18:21Right.
18:516 a.m.
18:53The two figures at the left hand side and right hand side are 4 and 10.
18:59So 4 minus 4 equals 10 minus 10
19:044 can be written as 2 squared
19:06And 10 can be written as 2 times 5
19:092 to the power of 2 minus 2 to the power of 2
19:13Equals 2 times 5 minus 2 times 5
19:16And when we twist it a bit
19:18We get 2 minus 2 in brackets
19:212 plus 2 in brackets
19:22Equals 5 times 2 minus 2 in brackets
19:27Cancelling 2 minus 2 in brackets from both sides
19:30We get 2 plus 2 equals 5
19:33All proved, right?
19:35Please don't try it out during your math class
19:37I'm sure your teacher won't be impressed
19:39This one is just for fun
19:42This one's not a math riddle
19:44But yet another magic math trick
19:46That may come in handy in an exam
19:48Here's how you can quickly square a 2-digit number
19:51That ends in 5
19:53Let's use the number 35 as an example
19:56Step 1
19:57Multiply the first digit by itself plus 1
20:00Step 2
20:02Put a 25 at the end
20:0435 squared equals 3 times 3 plus 1 in brackets
20:08And 25
20:103 times 3 plus 1 in brackets equals 12
20:1312 and 25 equals 1225
20:1835 squared equals 1225
20:22Voila!
20:24Neat, right?
20:27Here comes another multiplication trick
20:29To easily multiply any number by 5
20:32Simply divide the number by 2
20:34And multiply it by 10
20:36For example, multiply 64 by 5
20:39Step 1
20:41Divide 64 by 2 equals 32
20:44Step 2
20:45Multiply 32 by 10
20:47All you need to do is add a 0 at the end
20:50You got 320
20:52And it only took you 5 seconds
20:56A bit more magic
20:58You already know how to multiply by 5 in no time
21:02And you can do the same with multiplying by 6
21:04Disclaimer, it only works for even numbers
21:07So, let's see how it works
21:09Let's say you need to multiply 4 by 6
21:12First off, you need to divide 4 by 2
21:16You got 2
21:17Next, place 4 after 2
21:19And you get 24
21:21That's the final answer
21:22Yeah, this may not work with bigger numbers
21:25Seems like it's easier to learn the multiplication table by heart
21:30Hey, I can read your mind
21:32If you don't believe me, then think of a number
21:34Keep it simple, you'll have to do a bit of math here
21:37And you may probably need a calculator to play this guessing game with me
21:42So, you think of a number
21:44Now multiply it by 3
21:45Done?
21:46Okay
21:47Now add 6
21:49Next step, you need to divide this number by 3
21:52Now subtract the number you thought of from the resulting number
21:55Let me guess
21:57As a result, you got 2, right?
21:59Uh-oh
22:00No magic involved
22:01It's just a smart math riddle
22:04It works with any number
22:07If you ever struggle to learn all the digits in the pi number, just give up
22:11There are trillions of them
22:13But there is a trick to remember at least 7
22:16Just say, how I wish I could calculate pi
22:19There are 3 letters in how
22:211 in I
22:234 in wish
22:241 in I
22:25Again
22:265 in could
22:289 in calculate
22:29And 2 in pi
22:31You got 3.141592
22:38The last but not the least riddle for you
22:415 people build a barn in 8 hours
22:43How long will it take 12 people to build a barn?
22:59It won't take any time at all
23:01Why would they build a new barn if those 5 have already done that?
23:04Give the guys a break
23:06Plus, this one is not about math at all
23:09We humans are pretty complicated
23:10And we don't obey math that much
23:13What if these 12 people will split into 2 teams of 6
23:16And start playing volleyball instead of building a barn?
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