1. Controlled Labs Brain Wash Brain Teaser Promo

Not really a riddle I guess, but a crazy difficult problem one of my professors asked my class and no one figured it out:

There is a pile of twelve coins, all of equal size. Eleven are of equal weight. One is of a different weight. In three weighings find the unequal coin and determine if it is heavier or lighter.

http://mathforum.org/library/drmath/view/55618.html

2. Reddit is hilarious:
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3. Originally Posted by Sean1332
lol that's so stupid, yet...I laughed! You're lucky I'm a dad and dig dumb dad jokes.

Send me your (US only) shipping info and the flavor that your heart desires! Fruit punch, apple, lemonade.
My wife calls it an “Oldman” joke!

4. If the science major asks "Why does it work?”, the engineering major asks "How does it work?", and the business major asks "How much will it cost?"

What does the liberal arts major ask?

Do you want fries with that?"

5. Originally Posted by Push50
If the science major asks "Why does it work?”, the engineering major asks "How does it work?", and the business major asks "How much will it cost?"

What does the liberal arts major ask?

Do you want fries with that?"
I was expecting it to go something like this:

“The science major asks ‘why does it work?’

The engineering major asks ‘how does it work?’

The liberal arts major asks ‘how do I find work?’”
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6. A man is found dead on a little island. He was alone on the island. He did not starve or commit suicide. He wasn't poisoned or killed by a wild animal. How did he die?

He was on a traffic island and was hit by a car.

7. 25. The 25th triangle is hidden in the ‘A’ in the artist’s signature in the right-hand corner.

8. In front of you there’s a table with a hundred dollar bill, a ten dollar bill, a nickel, a five dollar bill, a quarter, and a penny. Which of these is worthless?

A: none, they’re all worth something

9. Originally Posted by The Solution

25. The 25th triangle is hidden in the ‘A’ in the artist’s signature in the right-hand corner.
Did they count the triangles I highlighted (and other similar triangles in other areas)?

10. Originally Posted by muscleupcrohn
Did they count the triangles I highlighted (and other similar triangles in other areas)?
https://www.rd.com/funny-stuff/triangle-puzzle/
it came right off the webpage.
and there is a discussion here:
https://www.quora.com/How-many-trian...this-picture-1

11. There where six apples in a basket and six girls in the room. Each girl took one apple, yet one apple remained in the basket how ?

Last girl took the basket with the apple

12. who is the most desired guy at the nudist camp....the guy who can carry 2 cups of coffee AND twelve doughnuts....

who is the most desired girl at the nudist camp....the girl who can eat the twelfth doughnut!!!!!!!!!!!!!!!!!!!!

13. What kind of candy is never on time?

14. Originally Posted by thebigt
who is the most desired guy at the nudist camp....the guy who can carry 2 cups of coffee AND twelve doughnuts....

who is the most desired girl at the nudist camp....the girl who can eat the twelfth doughnut!!!!!!!!!!!!!!!!!!!!
Idk man, I don’t mind some curves but if she’s the type to put away a dozen doughnuts in a sitting she may not exactly be the most desirable at the nudist colony

15. Originally Posted by Hyde
Idk man, I don’t mind some curves but if she’s the type to put away a dozen doughnuts in a sitting she may not exactly be the most desirable at the nudist colony
lol...didn't say anything about the other 11, it's that 12th one that really counts!!!

16. Originally Posted by DemntedCowboy
Alright send me your shipping info and what flavor you want!

17. Last category! Difficult brain teasers! Stump us!

19. As I was going to St. Ives, I met a man with seven wives. Each wife had seven sacks, every sack had seven cats, every cat had seven kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

As McClane fervently tries to do multiplication in his head, Zeus realizes this isn’t a word problem, it’s a riddle. The man was going to St. Ives when he met this man, meaning the man was coming from St. Ives. So the wives, sacks, cats, and kittens are irrelevant. Only the narrator is going to St. Ives, so the answer to the riddle is 1.

again I'll post another one from die hard see if it gets any love

20. A man man dies and is at the split between the doors to heaven and hell. He does not know which door is which and in front of each door are identical figures, one the devil, one an angel. Knowing that the devil will always lie, and the angel will always tell the truth, what 1 question can he ask (to either one), that will guarantee he chooses the door to heaven?

Answer - "what door will the other guy say HE is standing in front of?": No matter what, either guy would tell you the door HE is standing in front of.

-If he asks the devil (standing in front of the door to hell) he will lie and say the other guy would say he is standing in front of the door to hell (as the angel would have actually said heaven-the truth)
-If he asks the devil (standing in front of the door to heaven) he will lie and say the other guy would say he is standing in front of the door to heaven (as the devil would have actually said hell - the truth)

-If he asks the angel (standing in front of the door to hell) he will tell the truth and say the other guy would say he is standing in front of the door to hell (as the devil would have lied about actually being in front of the door to heaven)
-If he asks the angel (standing in front of the door to heaven) he will tell the truth and say the other guy would say he is standing in front of the door to heaven (as the devil would have lied about about actually being in front of the door to hell)

21. Originally Posted by booneman77
A man man dies and is at the split between the doors to heaven and hell. He does not know which door is which and in front of each door are identical figures, one the devil, one an angel. Knowing that the devil will always lie, and the angel will always tell the truth, what 1 question can he ask (to either one), that will guarantee he chooses the door to heaven?

Answer - "what door will the other guy say HE is standing in front of?": No matter what, either guy would tell you the door HE is standing in front of.

-If he asks the devil (standing in front of the door to hell) he will lie and say the other guy would say he is standing in front of the door to hell (as the angel would have actually said heaven-the truth)
-If he asks the devil (standing in front of the door to heaven) he will lie and say the other guy would say he is standing in front of the door to heaven (as the devil would have actually said hell - the truth)

-If he asks the angel (standing in front of the door to hell) he will tell the truth and say the other guy would say he is standing in front of the door to hell (as the devil would have lied about actually being in front of the door to heaven)
-If he asks the angel (standing in front of the door to heaven) he will tell the truth and say the other guy would say he is standing in front of the door to heaven (as the devil would have lied about about actually being in front of the door to hell)
That’s the riddle from the Labyrinth. And an episode of Yu-Gi-Oh.

22. One hundred tigers and one sheep are placed on a magic island that only has grass.

Tigers can eat grass, but they would rather eat sheep.

Assume:
A. Each time only one tiger can eat one sheep, and that tiger itself will become a sheep after it eats the sheep.
B. All tigers are smart and perfectly rational and they want to survive.

Will the tigers eat the sheep?

Solution: 100 is a large number, so let’s start with a simplified version of the problem.

If there is only 1 tiger (n =1), surely it will eat the sheep since it does not need
How about 2 tigers? Since both tigers are perfectly rational, either tiger probably would do some thinking as to what will happen if it eats the sheep.
Both Tigers are probably thinking, if I eat the sheep, I will become a sheep; and then the other tiger will eat me. So to guarantee the highest likelihood of survival, neither tiger will eat the sheep.

If there are 3 tigers, the sheep will be eaten since each tiger will realize that once it changes to a sheep, there will be 2 tigers left and it will not be eaten. Therefore, the first tiger that thinks this through will eat the sheep. If there are 4 tigers, each tiger will understand that if it eats the sheep, it will turn to a sheep. Since there are 3 other tigers, it will be eaten.
So to guarantee the highest likelihood of survival, no tiger will eat the sheep.

Following the same logic, we can naturally show that if the number of tigers is even, the sheep will not be eaten. If the number is odd, the sheep will be eaten. For the case
n =100, the sheep will not be eaten.

23. Can you spot the differences in these pictures?

24. Originally Posted by The Solution
Can you spot the differences in these pictures?