Can you solve the secret werewolf riddle? – Dan Finkel


You’re on the trail of a werewolf that’s been terrorizing your town. After months of detective work, you’ve narrowed your suspects to
one of five people: the mayor, the tailor, the baker, the grocer, or the carpenter. You’ve invited them to dinner
with a simple plan: you’ll slip a square of
a rare werewolf antidote into each of their dinners. Unfortunately, your pet goat
just ate four of the squares, and you only have one left. Luckily, the remaining square is 50 grams, and the minimum effective dose
is 10 grams. If you can precisely divide the
square into fifths you’ll have just enough
antidote for everyone. You’ll have to use a laser-cutting tool
to cut up the square; every other means available to you
isn’t precise enough. There are 8 points that can act
as starting or ending points for each cut. To use the device, you’ll
have to input pairs of points that tell the laser where to begin
and end each cut, and then the laser executes
all the cuts simultaneously. It’s okay to cut the square
into as many pieces as you want, as long as you can group them
into 10 gram portions. But you can’t fold the square
or alter it otherwise, and you only get one shot
at using the laser cutter. The full moon is rising, and in a moment someone
will transform and tear you all apart unless you can cure them first. How can you divide the antidote
into perfect fifths, cure the secret werewolf,
and save everyone? Pause the video now if you want
to figure it out for yourself. Answer in 3 Answer in 2 Answer in 1 When it comes to puzzles that
involve cutting and rearranging, it’s often helpful to actually
take a piece of paper and try cutting it up to see what
you can get. If we cut BF and DH we’d get fourths,
but we need fifths. Maybe there’s a way to shave a bit off
of a quarter to get exactly one fifth. Cutting BE looks good at first,
but that last cut takes a off a quarter of a quarter, leaving us with a portion of 3/16:
just smaller than a fifth, and not enough to cure a werewolf. What if we started with BE instead? That would also give us a quarter. And is there a way to shave
just a bit more off? Both DG and CH look promising. If we make one more cut, from A to F, we may start to notice something. With these four cuts—from B to E,
D to G, F to A, and H to C—we’ve got four triangles and a square in the middle. But the pieces that make
each triangle can also be rearranged to make a square
identical to the middle one. This means that we’ve split
the antidote into perfect fifths! What’s interesting about this
sort of problem is that while it’s possible to solve
it by starting from the geometry, it’s actually easier to start
experimenting and see where that gets you. That wouldn’t be as viable if the square
had, say, 24 cut points, but with just 8 there
are only so many reasonable options. You secretly dose each of the townspeople as the full moon emerges in the sky. And just as you do,
a terrible transformation begins. Then, just as suddenly, it reverses. Your measurements were perfect, and the people and animals of the
town can rest a little easier.

100 comments

  1. Get the solution to the bonus riddle here: https://brilliant.org/TedEdWerewolf/! Also, the first 833 of you who sign up for a PREMIUM subscription will get 20% off the annual fee. Riddle on, riddlers!

  2. For the riddle, just dose 4 of them then if it doesn't work you still know who the werewolf is. And in the bonus riddle their are all werewolves.

  3. Easy peasy
    Step one : wait until the animated square turns yellow in the video.
    Step two:follow the lines because they divide into fifths

    SERVE!

  4. I’m concerned with the fact that you have that kind of technology in that time period, judging from everyone’s cloths

  5. My Answer:
    If one of them was a human, why would all the 100 inhabitants say the same thing?
    Burn that place, all are werewolves

  6. Step 1 : Tell everyone to bring a gun
    Step 2 : The person will turn to a werewolf in your house, when this happens, tell everyone to shoot it
    Step 3 : Shoot your goat for being a fatty

  7. Please read. Because the statement is “at least one of us i human” we can determine they are all werewolves because if a human is present, then they would be telling the truth which is impossible for the werewolf. We also know they can’t be all humans because the person who got the disease couldn’t have got it by chance without the other inhabitants getting as well.

  8. If someone is only able to lie and another only able to tell the truth ask them something like what is 1 + 1 = ?

    It took me forever to figure this out…

  9. It can also be cutted 4/5 th is the 1st quarter and so on. Then we got 4 pieces on the upside of every quarters and then automatically we got an inside square. In Which all exactly add to be 1/5 th

  10. Actually you can just dissolve the antidote into the soup. And then separate the soup with antidote into exactly 5 bowls

  11. Bonus: They are all werewolves, a werewolf said that one of us is human if everyone said that, so that is wrong. Thus, there are no humans.

  12. Answer to the puzzle: we know 2 things –
    1. Atleast 1 of the 100 people is a werewolf
    2. werewolves always lie. And all the 100 people said this "Atleast 1 of us is a human", which means that is a lies which means that there is not a even a single human in the village. So the answer is all the 100 are werewolves.
    Like my comment if atleast a single person in this world understands my explanation.

  13. A few ways to easily fix the problem:

    Idea 1: Delay the dinner and turn it into a lunch, allowing you time to buy some more antidote off of where you got that later cutter

    Idea 2: If you have no time then simply bring some silver bullets and a gun

    Idea 3: If you don't want to kill them, then use the laser cutter to dissect your goat

  14. All were werewolfs cause everyone said atleast one of us is a human even the werewolfs in the village said that, it means it is a false statement and all are werewolfs

  15. There are no humans in the village. If there was one or more humans, the humans would be telling the truth. But, the we revolves would also be telling the truth. Therefore it's impossible. So the only other answer is that there are no humans, and all the werewolves are lying.

  16. My solution was to cut the antidote into 4 pieces, feed them to 4 of the suspects and then everyone holds a shotgun at the 5th person who didn't get the anecdote and shoot them if they transform into a werewolf.

  17. Or u can cut the cube in 4 pieces, which is really easy using the laster cutter. Then, if no one was cured, you know that the person who got no antidote is the ware wolf

  18. Bonus riddle: call in for a crusade of justice and burn that dark magic werewolf curse tainted village to ashes, you will be even rewarded for that

  19. -just cut it into 5 strips
    – put the whole thing in the pot while cooking it
    -smash it into a powder and measure out 10g
    -keep your antidote out of reach from goats

  20. That's not how laser cutting works.
    That's not how biologiy works (every person weighs differently so for every person there's a different effective dose).

  21. How you do it get some cheese wait for the werewolf to come out and eat the cheese for energy and wrestle the werewolf

  22. time to put my werewolves of millers hollow knowledge to the test.

    it's the mayor, it always is the mayor in that game. If it's not, it's the nervous and suspicious one. Duh

  23. Bonus riddle answer: Everyone is werewolf. As there is at least one werewolf, so when he said 'at least one of us is human' it has to be a lie.

  24. Or i would cut it into 1/4 and give it to 4 of them, and then the last one i will get a knife and say, "if you transform i will kill you".

    You never said they had to survive

  25. What would happen in the bonus riddle if instead of them all saying “At least one of us is human”, they all said “I am not a human.”
    If all the humans tell the truth, and all the werewolves lie, then;
    The humans would be telling the truth, and would all be werewolves. But then that would mean that they are actually lying, and are not werewolves.
    The same for the werewolves. They would be lying, and thus be humans. But would them be telling the truth, and not be human.
    Can some smart people in the replies tell me what the outcome would be, or would it just be infinitely fluctuating back and forth?

  26. Here’s a bonus bonus riddle!
    You’ve just received word that there is another town with more werewolves! What is it with all these werewolves?
    Anyway, you’ve separated the people into 2 groups, (group A and group B) and one group, and only one, is all werewolves, but you don’t know which. Again, all the werewolves lie, and all the humans tell the truth. But for some reason, they’ve all decided they’ll only answer one question per group. What do you ask each group?

  27. Answer: Get more antidote.
    Edit: I listened to it again and it said the antidote was “rare.” However, I think that’s bs because the dude had way more than he needed, making me believe it ain’t that rare.

  28. They are either all human or ww. If one or more were humans, the statement would be true. If they were all human it would also be true.

    We know that none of them are wws now, because we got the info from a ww and therefore it's a lie that there is at least 1 ww.

  29. My solution for the bonus question:
    Step 1:Conclude that all of them are werewolves because they are all lying that the village has at least one human.
    Step 2: Get some antidote.
    Step 3: CURE THEM

  30. or you can cut the square into 4, since the minimum effective dose is 10 but it never said you couldn’t go over, give the antidote to 4 people, and if none of them turn you know the last one is a werewolf

  31. Plot twist: You’re in a hospital bed and you are in a coma imagining all of these riddles, so it doesn’t matter what you do

Leave a Reply

Your email address will not be published. Required fields are marked *