# LOGIC RIDDLES

### Fun Facts (Hints)

Here are a few facts about logical thinking. They may be able to help you in solving a few of these riddles:
• Logic has a few definitions, but is most known as the study of reasoning.
• Logic is used everyday in areas like mathematics, computers, and philosophy.
• The word logic is derived from the Greek word "logos."
• The creation of the study of logic is often attributed to Aristotle.
• Aristotle's study of logic has had a tremendous impact on the history of the world.
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## A Metal Room With A Metal Door

Hint:
Play the piano till he finds the right key.
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Solved: 62%

## Shooting The Shotgun

Hint:
It is a SHOTGUN. It shoots multiple bullets at a time. You should know what to do from there.
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Solved: 64%

## 100 Lbs Riddle

Hint:
They both weigh the same 100 pounds
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Solved: 87%

## 100 Blank Cards Riddle

Hint: Perhaps thinking in terms of one deck is the wrong approach.
Yes!

A sample strategy:
Divide the deck in half and turn over all lower 50 cards, setting aside the highest number you find. Then turn over the other 50 cards, one by one, until you reach a number that is higher than the card you set aside: this is your chosen "high card."

Now, there is a 50% chance that the highest card is contained in the top 50 cards (it is or it isn't), and a 50% chance that the second-highest card is contained in the lower 50. Combining the probabilities, you have a 25% chance of constructing the above situation (in which you win every time).

This means that you'll lose three out of four games, but for every four games played, you pay \$40 while you win one game and \$50. Your net profit every four games is \$10.

Obviously, you have to have at least \$40 to start in order to apply this strategy effectively.
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## 30 Sacks Of Coconuts

Hint:
He will have 25 coconuts with him at the end. The trick is to reduce the number of sacks as you pass checkpoints.

The first 10 checkpoints require 3 coconuts each, which empties his first sack. The next 15 checkpoints require 2 coconuts each, which will empty his second stack. Now, he is left with 1 sack and 5 more checkpoints. So, the 5 checkpoints will take 1 coconut each. Therefore, he will be left with 25 coconuts.
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Solved: 47%

## Crossing The Desert Riddle

Hint:
He takes four weeks of food and leaves two weeks of food supplies in the one week mark and goes back with the one week of food supply left. Then he goes back with four weeks of food and picks up one week of food supplies from the one week mark giving him four again in total, then he leaves two weeks of supply in the two week mark and goes back to the one week mark and picks up the one week food supply to go back. Then he leaves with the four weeks of food supply and goes to the two week mark and picks up the two week food supplies that were there giving him four weeks of food again, then he goes to the Nile River with the four weeks supply of food.
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Solved: 40%

## Trapped In A Haunted House

Hint:
The one where you get electrocuted, there is no electricity!
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Solved: 80%

Hint:
He threw the ball straight up in the air.
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Solved: 59%
Hint:
He has only gotten one fortune cookie.
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Solved: 64%

Hint:
His nose did grow when he said it would, but his nose is only supposed to grow when he lies, and his nose would grow even though he told the truth, and the paradox appears to exist again.

You can prove that's not true because he created a self fulfilling prophecy when he said his nose was going to grow bigger because saying that was saying he was going to lie.

In order to lie; he had to tell the truth, and say that he was lying, when he was really telling the truth, which would be a lie.

He did say he was lying because he said his nose was going to grow, and even though he said he was lying, he was actually telling the truth; which means he was lying about lying, or lying about not telling the truth.

His nose did grow, and he did tell the truth, but he said he was lying when he was telling the truth, which was the lie that made his nose grow.

Since his nose didn't grow after he told the truth, but after he lied about not telling the truth; the paradox doesn't exist.

That second answer actually works for both scenarios, where as the first answer only works for the first scenario, so I suppose you can say the second answer is the correct one.
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Solved: 60%

## Rope Burn Riddle

Hint: You can light multiple ends and/or multiple ropes at the exact same time.
Light both ends of one rope, and only one end of the other rope. This will cause the first rope to burn out in 30 minutes. When the first rope burns out, there will be 30 minutes left on the second rope. So then, light the other end of the second rope, and the rest of it will burn out in 15 minutes. 30 + 15 = 45 minutes.
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## Rooster On Top Of A Roof

Hint:
Roosters don't lay eggs, hens do. there is no egg!
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Solved: 75%

## Drinking Soda Riddle

Hint:
Helen is drinking coffee. Logic : People drinking coffee have two Es in their name
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Solved: 58%

## Pound For Pound Riddle

Hint:
Neither, they both weigh one pound.
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Solved: 83%

## 6 Girls Riddle

Hint:
7. Each girl has the same brother.
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Solved: 77%

## Post Your Logic Riddles Puns Below

Can you come up with a cool, funny or clever Logic Riddles of your own? Post it below (without the answer) to see if you can stump our users.

1. Why did the logician break up with his girlfriend? Because they had too many fallacies in their relationship.

2. How do you catch a squirrel using formal logic? Set up a syllogism with a nut as the conclusion.

3. Why did the philosopher refuse to go to the grocery store? Because he didn't believe in a posteriori knowledge.

4. Why did the mathematician go on a diet? To solve the weight problem.

5. Why did the chicken cross the road using propositional logic? To get to the other side of the truth table.

6. What do you call a logician who takes a long time to reach a conclusion? A syllogism.

7. How many logicians does it take to change a light bulb? None, they prefer to sit in the dark and contemplate the nature of light.

8. Why couldn't the logician sleep? He kept trying to form an adequate negation of "I am sleepy".

9. Why did the logician wear a two-colored hat? To ensure that the Law of Excluded Middle didn't apply.

10. What do you call a fallacious argument from a cow? A mooot point.

11. Why did the logician refuse to play cards with his friends? Because he doesn't believe in chance.

12. What do you call a logical argument from a whale? A cetacean of reason.

13. Why did the chicken refuse to enter the barn? Because the premise of the door's existence was never established.

14. How many philosophers does it take to change a light bulb? None, they would rather question the existence of light.

15. Why did the logical argument cross the road? To prove it was valid.

16. What do you call perfect deductive reasoning? A genius's argument.

17. Why was the logician's car a convertible? So they could put the top down for implication.

18. How many logicians does it take to screw in a light bulb? They would argue about the definition of "screw".

19. Why did the mathematician take a job as a lion tamer? To solve the problem of fear.

20. What do you call a logical argument from a computer? An algorithm of reasoning.

21. Why did the chicken cross the Mobius strip? To get to the same side.

22. How many philosophers does it take to agree on anything? The world may never know.

23. Why did the logician refuse to go to the beach? There were too many ways to take "wave" out of context.

24. What's the difference between an illogical chicken and a logical chicken? The latter crosses the road with a premise and a conclusion.

25. Why did the philosopher quit smoking? Because he realized that causation does not equal correlation.

26. What do you call a logical argument from a bird? A fowl syllogism.

27. Why did the logician refuse to watch movies? They already knew how it was going to end.

28. Why did the mathematician start a garden? To find a square root.

29. What do you call an argument that can talk but not walk? An invalid conclusion.

30. Why did the logician refuse to enter the world of online dating? Because it contradicts the Law of Identity.

31. What do you call a logical argument from a bee? A logical buzz.

32. How does a logician propose to their significant other? With a valid argument and a promise to never commit a fallacy.

33. Why did the philosopher join a gym? To prove that mind and body are not separate entities.

34. What do you call a logical argument from a snake? A reasoned hiss.

35. Why did the chicken refuse to participate in the Monty Hall problem? They had already established their pick as a matter of existential identity.

36. How do you get a logician to take a break? Present them with an unsolvable paradox.

37. Why did the logician refuse to eat the apple? They were suspicious of the causality behind it.

38. What do you call a logical argument from a hippo? A logical exercise.

39. Why did the philosopher refuse to attend the party? They didn't want to commit to the fallacy of generalization.

40. What do you call a logical argument from a donkey? A logical hee-haw.

41. Why did the logician refuse to go on vacation? The premise and conclusion of relaxation were never clearly defined.

42. What do you call a logical argument from a cricket? A logical chirp.

43. Why did the mathematician invest in the stock market? To solve the problem of exponential growth.

44. How can you tell if a logical argument is lost? It starts to formulate a premise and conclusion in circles.

45. Why did the logician refuse to go to the amusement park? They were integral to an ongoing proof.

46. What do you call a logical argument from a fish? A logical swim.

47. Why did the philosopher refuse to eat meat? They were argumentatively against the premise of animal exploitation.

48. What do you call a logical argument from a squirrel? A logical nut.

49. Why did the logician refuse to get a pet? Too many variables in the equation.

50. What do you call a logical argument from an alligator? A logical snap.