### 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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Riddles and Answers © 2021

## A Metal Room With A Metal Door

A prisoner was stuck in a metal room with a metal door that was locked. There was no windows and nothing in the room but a piano. What can he do to escape?

Hint:

## Shooting The Shotgun

You are trapped in a hole with three maniacal murderers. You have a shotgun but you only have 2 cartridges. How do you shoot them all?

Hint:

It is a SHOTGUN. It shoots multiple bullets at a time. You should know what to do from there.

YES NO

*Did you answer this riddle correctly?*YES NO

## 100 Lbs Riddle

Hint:

## 100 Blank Cards Riddle

Someone offers you the following deal:

There is a deck of 100 initially blank cards. The dealer is allowed to write ANY positive integer, one per card, leaving none blank. You are then asked to turn over as many cards as you wish. If the last card you turn over is the highest in the deck, you win; otherwise, you lose.

Winning grants you $50, and losing costs you only the $10 you paid to play.

Would you accept this challenge?

There is a deck of 100 initially blank cards. The dealer is allowed to write ANY positive integer, one per card, leaving none blank. You are then asked to turn over as many cards as you wish. If the last card you turn over is the highest in the deck, you win; otherwise, you lose.

Winning grants you $50, and losing costs you only the $10 you paid to play.

Would you accept this challenge?

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.

YES NO

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.

*Did you answer this riddle correctly?*YES NO

## 30 Sacks Of Coconuts

An intelligent trader travels from one place to another with 3 sacks having 30 coconuts each. No sack can hold more than 30 coconuts. On the way, he passes 30 check points. At each check point, he has to give one coconut for every sack he is carrying. What is the maximum number of coconuts that he can have with him at the end of his journey?

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.

YES NO

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.

*Did you answer this riddle correctly?*YES NO

## Crossing The Desert Riddle

A camel driver has to cross the desert and get to the Nile River to transport his merchandise. It takes six weeks to cross the desert and get to the Nile River. He can only carry four weeks of food for himself and his camel at any time because the camel also has to carry his merchandise. If he can not get help from anyone else or get anymore camels, and there is an unlimited supply of food where he is at, how can he cross the desert and get to the Nile River?

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.

YES NO

*Did you answer this riddle correctly?*YES NO

## Trapped In A Haunted House

You are trapped in a haunted house with no electricity. There are four doors to get out of the house only one is safe. In one door a man will stab you, in another you will get electrocuted, in another one you will get shot at, in the final one it is filled with vicious dogs. Which door is safe?

Hint:

The one where you get electrocuted, there is no electricity!

YES NO

*Did you answer this riddle correctly?*YES NO

## Throwing A Basketball Riddle

A man takes a basketball and throws it as hard as he can. There is nothing in front, behind, or on either side of him, and yet, the ball comes back and hits him square in the face. How can this be?

Hint:

## A Fortune Cookie Riddle

A man says that every time he has gotten a fortune cookie his lucky numbers have always been the same, how is this possible???

Hint:

## Pinocchio Paradox Riddle

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.

YES NO

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.

*Did you answer this riddle correctly?*YES NO

## Rope Burn Riddle

You have two ropes. Each rope takes one hour to burn. These ropes are not identical, nor are they uniform; i.e. it does not necessarily take half an hour for half the rope to burn (if you have trouble visualizing this, imagine a rope of varying thickness across its length). With only these two ropes and a way to light them, how do you measure out 45 minutes?

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.

YES NO

*Did you answer this riddle correctly?*YES NO

## Rooster On Top Of A Roof

Hint:

## Drinking Soda Riddle

In a restaurant drinks are served as per the name of the person.

Elizabeth, George, and Steve are drinking coffee.

Becky, Melissa, and Eva are drinking soda.

Using logic, is Helen drinking coffee or soda?

Elizabeth, George, and Steve are drinking coffee.

Becky, Melissa, and Eva are drinking soda.

Using logic, is Helen drinking coffee or soda?

Hint:

Helen is drinking coffee. Logic : People drinking coffee have two Es in their name

YES NO

*Did you answer this riddle correctly?*YES NO

## Pound For Pound Riddle

Hint:

## 6 Girls Riddle

Hint:

## Post Your Logic Riddles 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.