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Logic

1123 riddles

Riddles that derive from deduction and logical thinking.

You are standing in front of a room with one light bulb inside of it. You cannot see if it is on or off. Outside the room there are 3 switches in the off positions. You may turn the switches any way you want to. You stop turning the switches, enter the room and know which switch controls the light bulb. How?
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There is a man lying dead in his office. He is all alone and the doors and windows are locked from the inside. There are no marks on him. There is no blood. There is a sealed envelope on his desk. How did he die?
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A man decides to buy a nice horse. He pays $600 for it and he is very content with this strong animal. After a year the value of the horse has increased to $700 and he decides to sell the horse. But already a few days later he regrets his decision to sell the beautiful horse and he buys it again. Unfortunately he has to pay $800 to get it back so he loses $100. After another year of owning the horse he finally decides to sell the horse for $900. What is the overall profit the man makes?
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The ages of a father and son add up to 66. The father's age is the son's age reversed. How old could they be? (3 possible solutions).
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You have a 5 gallon bucket, a 3 gallon bucket, and a hose to fill them up. You need to get 4 gallons. You have no means of measuring how many gallons are in each bucket (except knowing the bucket capacity). How can you be certain that you have 4 gallons?
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Jack is a farmer and owns some chickens. One day, he took a basket of fresh eggs to the market to sell.

The first person bought half of all the eggs in the basket and half an egg.

Then, the second person bought half of the remaining eggs and half an egg.

Later, the third person bought half of the remaining eggs and half an egg.

Now Jack's basket has only 1 egg left.

If no eggs were broken in the process, how many eggs did he originally have in his basket?
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What word doesn't belong in this group?

that, hat, what, mat, cat, sat, pat, or chat.
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A farmer in California owns a beautiful pear tree. He supplies the fruit to a nearby grocery store. The store owner has called the farmer to see how much fruit is available for him to purchase. The farmer knows that the main trunk has 24 branches. Each branch has exactly 12 boughs and each bough has exactly 6 twigs. Since each twig bears one piece of fruit, how many plums will the farmer be able to deliver?
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A black dog stands in the middle of an intersection in a town painted black. None of the street lights are working due to a power failure caused by a storm. A car with two broken headlights drives towards the dog but turns in time to avoid hitting him. How could the driver have seen the dog in time?
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A man wants to enter an exclusive club, but he doesn't know the password. Another man walks to the door and the doorman says 12, the man says 6, and is let in. Another man walks up and the doorman says 6, the man says 3, and is let in. Thinking he had heard enough, he walks up to the door and the doorman says 10, he says 5, and he isn't let in. What should he have said?
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