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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    Logical Riddles & Answers

    Logic Riddles
    Here is a collection of logic & technical riddles that we have found by searching all throughout the internet. Though there are many who tend to suggest that riddles don't exhibit logic and reason, this assortment of riddles most certainly proves that this sentiment is false.

    Put your logic skills to the test by spending a little bit of time attempting to solve this challenging set of logical riddles. Keep in mind as you take on these brain teasing questions, that the best way to solve this particular set of questions is to rely upon your common sense. In other words, these aren't the types of riddles that you should have to think about for a long amount of time. The first answer to pop in your head will more than likely be the correct answer.

    Happy riddling!

    100 Lbs Riddle

    Hint:
    They both weigh the same 100 pounds
    Did you answer this riddle correctly?
    YES  NO  

    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.
    Did you answer this riddle correctly?
    YES  NO  

    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.
    Did you answer this riddle correctly?
    YES  NO  

    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.
    Did you answer this riddle correctly?
    YES  NO  

    Trapped In A Haunted House

    Hint:
    The one where you get electrocuted, there is no electricity!
    Did you answer this riddle correctly?
    YES  NO  

    Throwing A Basketball Riddle

    Hint:
    He threw the ball straight up in the air.
    Did you answer this riddle correctly?
    YES  NO  
    Hint:
    He has only gotten one fortune cookie.
    Did you answer this riddle correctly?
    YES  NO  

    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.
    Did you answer this riddle correctly?
    YES  NO  

    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.
    Did you answer this riddle correctly?
    YES  NO  

    Rooster On Top Of A Roof

    Hint:
    Roosters don't lay eggs, hens do. there is no egg!
    Did you answer this riddle correctly?
    YES  NO  

    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.
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