Brain Teasers & Puzzles
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There is a person who delivers milk to houses. He has lost some of his measuring utensils. He has left with only 3 utensils of sizes 3 Liters, 5 Liters, and 8 Liters. The Milkman is having 8 Liters of milk and he has to deliver 4 Liters of milk. Your Task is to help him measure exactly 4 Liters using the above mentioned utensils only. You can tell him the solution by writing steps or by drawing the utensils and coloring the parts filled with milk.
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There’s a man lying dead in a telephone booth beside a river. The phone is off the hook, and there is smashed glass on the floor of the phone booth. What happened?
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John and Jacob are on the two opposite banks of a river. They both have a rowing boat.
They both start at the same time towards the opposite bank. They pass each other at 180 meters from the bank where john departed. When reaching the opposite bank, they both take a rest for the same amount of time before they return. On the way back, they pass each other at 100 meters from the bank from where John returned.
John and Jacob both row with a constant speed, but Jacob rows faster.
How wide is the river?
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Imagine a disk spinning like a record player turn table. Half of the disk is black and the other is white. Assume you have an unlimited number of colour sensors. How many sensors would you have to place around the disk to determine the direction the disk is spinning? Where would they be placed?
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There is an island of monks where everyone has either brown eyes or red eyes. Monks who have red eyes are cursed, and are supposed to commit suicide at midnight. However, no one ever talks about what colour eyes they have, because the monks have a vow of silence. Also, there are no reflective surfaces on the whole island. Thus, no one knows their own eye colour; they can only see the eye colours of other people, and not say anything about them. Life goes on, with brown-eyed monks and red-eyed monks living happily together in peace, and no one ever committing suicide. Then one day a tourist visits the island monastery, and, not knowing that he’s not supposed to talk about eyes, he states the observation “At least one of you has red eyes.” Having acquired this new information, something dramatic happens among the monks. What happens?
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In the city of Mexico, the following facts are true:
No two inhabitants have exactly the same number of hairs.
No inhabitant has exactly 483,207 hairs.
There are more inhabitants than there are hairs on the head of any one inhabitant.
What is the largest possible number of inhabitants of Mexico?
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