195+ Logic Riddles with Answers
Some cogs are tigs.
All tigs are bons.
Some bons are pabs.
Some pabs are tigs.
Therefore, cogs are definitely pabs. - True or False?
Finished files are the result of years of scientific study combined with the experience of years.
How many F's are in the previous sentence?
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?
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?
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 a few days later he regrets his decision so he buys back the horse 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?
The world’s tallest skyscraper took seven years to build. Each year the workmen were able to double its height. How many years did it take for the skyscraper to reach half of its maximum height?
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?
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?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. After much trying, you might be able to remove the third one also, but it remains. It dies hard!
Down below the shining moon
Around the trees, a sacred gloom
Running with the midnight sky
Knowing that which makes you cry
Night is full with my essence
Eternal light betrays my presence
Soaring through my endless task
Shadows are my faithful mask
Carol is traveling by ship from south of the equator to the north. She has a nice little second class cabin which has a bathroom, but no window. Carol has no compass nor other instruments. Yet, without leaving her room or talking with anyone, Carol knew exactly when the ship crossed the equator.
How did she know?
A snail is at the bottom of a 20 meters deep pit. Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. How many days does it take before the snail reaches the top of the pit?
There were an electrician and a plumber waiting in line for admission to the Home Show. One of them was the father of the others son. How could this be possible?
A doctor gives you three pills and tells you to take one every half an hour. How long will the pills last?
If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?
There are 2 ducks in front of 2 other ducks. There are 2 ducks behind 2 other ducks. There are 2 ducks beside 2 other ducks. How many ducks are there?
Walking home one day, you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge, you hear the train whistle somewhere behind you. You charge across the bridge, and jump off the track as the train is about to run you down. As it happens, if you had gone the other way, you would have reached safety just before being run over as well. If you can run ten miles per hour, how fast is the train moving?