You are the cargo director on the maiden

voyage of the S.S. Buoyant, and you’ve agreed to transport

several tanks containing the last specimens of a critically

endangered fish species to their new aquarium. Unfortunately, as you’re passing

through shark-infested waters, the boat is battered by a fierce storm,

throwing your precious cargo overboard. And to make matters worse, no one seems certain

just how many fish tanks are missing. Fortunately, you have a rescue sub

at your disposal, but only enough fuel for one trip

to the ocean floor. You need to know where the tanks are so you can gather them all

in one quick pass. Not a single fish can be lost. You decide to scan the three sectors

of the ocean floor where the cargo could have landed. Thermal imaging shows 50 organisms

in the area, and you quickly realize that that number

includes both your fish and some ravenous sharks. You flip on the sonar

to get a better look. The image for Sector Alpha shows

four tanks and two sharks, the image for Sector Beta shows

two tanks and four sharks, and the image for Sector Gamma

is blank. Your sonar has malfunctioned, and you’re going to have to go

with the info you have. You check the shipping notes, but all you learn is that each tank

had the same number of fish inside. The cargo hold had space for anywhere

from 1 to 13 total tanks. And finally, the old captain tells you

that this area has the odd property that no two sectors can have the same

number of sharks, but every sector will have at least one, and no more than seven. There’s no time to waste. The tanks won’t withstand the pressure

much longer. As you descend in the sub,

you review everything you know. How many fish tanks do you need

to find in Sector Gamma? Hurry, the fate of an entire species

depends on you. Pause here if you want

to figure it out for yourself. Answer in: 3 Answer in: 2 Answer in: 1 At first, it seems like there are just

too many missing pieces of information. After all, you don’t know how many fish

or how many tanks there are, let alone how many fish are in each one. But then you remember the best way to compare multiple pieces

of partial information – a table. Since we know there are thirteen

tanks at most, and we already see six tanks

in Sectors Alpha and Beta, we know the total number of tanks

must be between 6 and 13. We also know that each sector has

a different amount of sharks with no more than seven in each one. Since there are two in Sector Alpha

and four in Sector Beta, Sector Gamma can have

1, 3, 5, 6, or 7 sharks. What about the number of endangered fish? Out of the 50 total organisms

in all three sectors, we know at least seven are sharks, leaving a maximum of 43 fish

inside all the tanks. And the more sharks we find in Sector 3,

the fewer fish there are to save. Now, remember that the fish are

equally distributed across all the tanks. Why is that important? Because it means that one of the possible

values for the total amount of fish must be divisible by one of the possible

values for the total amount of tanks. And looking at the table, we can see

that the only combination that works is 39 fish divided between 13 tanks

with three fish in each. With sharks swarming around, you quickly pilot the sub through

the first two sectors before retrieving the remaining

seven tanks in Sector Gamma. You’ve saved the species

and taken an impromptu dive. All in all, not a bad day,

unless you happen to be a hungry shark.

All who got it correct should get 200 out of 100. One for guessing the question and another for answer.

By 2:07 I’m like “just this story is too damn complicated”

Easy one

Anyone else notice that at the beginning of the video he said that we agreed to take seven fish tanks on the trip and later on he said there was 13 total fish tanks that fell.

I actually got one of these right omg

J

can you sort it

Omg i actually figured it out!

I actually managed to solve it myself! But I didn't make a table, I just did it by trial and error to see how many fish would make sense- from 44, to 43, 42, 41, 40 and finally 39 on the sixth guess (divided by 3 of course).

S H A R K I N F E S T E D W A T E R SI solved the riddle

With math

I somehow miraculously solved the riddle XD

People of the Ted Ed Riddle community "How many riddles have you solved without help?"

Such a victory when I solve one! But then I see how you’re “supposed” to solve it and I just get a headache lol

According to YouTube comments on another video, I am an hungry shark and this results displease me

Just fly.

Around it.

I finally got the answer

I feel so proud! I finally solved this! With the power of algebra, millions of trial and error and eternity upon eternity.

Just… get one crate and then breed them

Hmmmm very "fishy" XD

There r 50 fish but 6 box what?

50:6=8 (2 left) ok dis r so wej

YES!!! I SOLVED IT!

Plot Twist: A shark somehow hid inside a crate and the fish die

LEVITATION?!!!!!

This is the second Ted ed riddle I could solve yayy

But you went through all of them anyway?

1:31

that doesn’t look like a malfunctionCan we talk about why the sharks have two eyes and a unibrow on one side of their faces.

I did it i finally solved 1 puzzle men finally even if i didnt use a table i did it

This was legit the first Ted Ed riddle I solved myself first!!!!!

OMG I SOLVED IT

I thought the answer was 4 sharks and 2 tanks because I thought each tank contained 5 🐠:

Sector Alpha- 2 sharks and 4 tanks(4×5=20 🐠)

Sector Beta- 4 sharks and 2 tanks (2×5= 10 🐠)

[now there are 36 creatures because: 20 🐠 +10 🐠 +6 🦈 =36]

So Sector Gamma- 4 sharks and 2 tanks.

That way —> 36 creatures in the first and second sectors + 14 (2 tanks x5= 10 🐠+4 🦈 =14)=50 creatures.

:/

My personal riddle:

What should i use to video games on?

Oh i know!

2:49

That was easy

If the fish are critically endangered than shouldn't some be put in safer places? Why transfer all of them to a aquarium?

"You have just enough fuel to make one trip to the ocean floor"

Oh well. Should have refueled, huh?

Just…don't go into the shark infested waters

Or go by plane?

The guy said "7" at 4:16 incorrectly, as the video already showed, it was 5. Had me worried.

I SOLVED ITT WOOOOHOOOO FEELS GOOD MAN!

I did it I did it for the first time ever!!!

The first riddle I actually solved

Quite simple, but interesting

It is a very good logic puzzle.

Thank you ted-ed

I know i cant but i will still see it

This riddle tells to never become a cargo director

I used around 5 minutes to work out…

so the number of sharks in the sector gamma can be 1,3,5,6,7

Considering the number of fish must not be a prime number, and there are already 6 tanks.

Only when the number of sharks in sector gamma is 5 or 6, the number of fish appears to be a composite number.

When it’s 6, the number of fish will be 38=19*2 we can’t have neither 19 tanks or 2 tanks total

When it’s 5, the number of fish will be 39=13*3. There will be 13 tanks total and it’s the only solution.

Therefore, the number of tanks in sector gamma will be 13-2-4=7

I figured this out when paused at2:30

No i cannot but ill still watch and like though

Go to the first sector and get a tank and count how many fish in there

i use the table too!!

Mode 7 of the 570es plus

This is one of the few riddles that I could solve

Cool riddle but why would you go straight to the ocean depths before making a plan

OMAYGAD I actually solved this riddle OMFG

How are these fish and the sharks the ONLY flipping living organism in that area

No coral

No like plankton

Nothing

Great, this is always the worst possible situation

7

Woohooo I'm on a roll!!

a boring table work is not a riddle

It has to be a total of 13 tanks with 3 fish each right?? Bc that alone would make 39 fish then add the 6 sharks from sector alpha and beta and now u have 45, which brings me to the solution that in section gamma there have to be 5 remaining sharks so that there is a total of 50 fish.

In conclusion there have to be 7 tanks and 5 sharks in sector gamma and each tank has 3 fish, add that with the number of fish of the other sectors and u have 50 fish.

Not upto the mark of. Ted ed

step one- question how you only lost the fish and not the other stuff even though your ship went into a spaz

this was surprisingly EZ

Guys i solved it on my own… My first…. But i used a different method… it's algebraic

.

.

Let total no of fishes in each aquarium be f…

Than 2+4f+4+2f+x+yf= 50

where x and y r the no of sharks and no of tanks respectively

.

(6+y)f=44-x

f=44-x/6+y

Now f can't be a fraction,it can only be a whole no

And

x+6≤7 and x can't be 2and 4, only possible values r 1,3,5 and 6

Subtracting by 1 and 3 gives us a prime no so impossible and by 6 gives us 38 as numerator which has to be divided by 6+y so y should be equal to 13 which is not possible.. leaving us only with 5

Substituting this value we can get

.

.

44-5/6+7=3

Hence no of fish in each tank = 3 and total tanks in sector gamma is 7 and shark=5

.

Ps:- I couldn't resist myself sharing my solution and it's also the first comment i wrote… hope it doesn't goes unnoticed.

Everyone in the comment section has got the answer. Now I regret not pausing the video to try it myself.

I know this is really cringe but I can’t help but say this is my 2nd solved puzzle

NO WAY I GOT IT. I used algebra. I put the tanks in gamma to the max of being 7 tanks(13-2-4=7). Then made 39 divisible by 13. This is a confusing explanation but I still got 3 fish in each tanks, being 39 tanks. ALRIGHT

So your telling me there’s no other fish in the shark area? Those sharks are screwed!

Rides submarineWrites down table whilst driving submarineDies of submarine crashI hate when this happens

Why can't I just catch sharks?

Lmao~~~~~~~~~~~

Wait, can I get a promotion if I found all the missing tanks?

First one I solved on my own.😅

Or… Not go through shark infested waters in the first place???

Did this happen in the bermuda triangle? Just asking…

YES I FINALLY GOT ONE. too bad they made it look so much easier

Who in their right mind would actually set sail knowing fully well what is coming ahead? 😂

You: hit storm

Rare fish: lost

Sharks: In water

Cargo: In sea

Escape ship: you in

Actually ship: sunken

Fuel: only 1 tank

Radar: gone bad

Submarine: to get fish tanks

Tanks: less than 13

Sharks: less than 7 in each area

Sharks and fish: 50

Hotel: Trivago DUH

guess it wasnt that buoyant

I don't freaking understand anything, the logic was just too deep for my brain

What? There was said that in each tank there is equal number of fish… At the end it is 3 fish in each tank? 3 is not equal!

So happy I could solve it!

You wouldve known how many tanks you had initially, you could have counted how many tanks were left on deck after the big wave, then you would automatically know.

i just copied the chart down to look at in class im a guenius

If it was up to me, all those fishes would be sleeping with the fishes… Wait a minute…

You can make it so that there four sharks and 0 fish in the final scan which still makes it come up with fifty

I wish i had the intelligence to solve these riddlers.

So, are these the rare fish from Einstein’s Riddle?

If there is no life in the water other than the sharks, then how do the sharks survive lol

first riddle i could solve without seeing the answer

The first one that I got correct , after some 10-15 incorrect

It's answere will also be 9 boxes with five fishes in each please calculate it ,I know am right

From 0:29 wtf the ship ded

You didn't finish your final sentence.

"Unless you happen to be a hungry shark,looking for an exotic meal."

the real question is: Why did u put the tanks on the top

My maths sir sent us a list of TED talks to decide on our project topic. I just saw the word ' fish' and decided to take this without watching the video. But now I can't understand the sum properly. And Maths is my least fav subject.😩

Solved this one. It really isn't a riddle. It's just direct math

je remercie les traducteurs qui ont traduit en français

Got it 🙂

He went to all three sectors and retrieved all the boxes, didn't need all the math.

I solved this one. It felt good.

Why is that shark eating a shoe

Anyone else hate the music and voice in these videos?

Why give the sectors such weird names