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210

• At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?

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pnikam Expert
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• Three students checked into a hotel and paid the clerk \$30 for a room (\$10 each). When the hotel manager returned, he noticed that the clerk had incorrectly charged \$30 instead of \$25 for the room. The manager told the clerk to return \$5 to the students. The clerk, knowing that the students would not be able to divide \$5 evenly, decided to keep \$2 and to give them only \$3.

The students were very happy because they paid only \$27 for the room (\$9 each). However, if they paid \$27 and the clerk kept \$2, that adds up to \$29. What happened to the other Dollar?

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pnikam Expert
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• You probably eat this chemical every day. Do you know what it is?

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pnikam Expert
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• There are twelve identical-looking balls, but one is either heavier or lighter than the other eleven. How can you determine which is the odd ball and find out whether this ball is heavier or lighter than the others using only three weighings with a balance?

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pnikam Expert
• 788.8K views

• A scientist is experimenting with bacteria that are one micron in diameter and that reproduce by dividing every minute into two bacteria. At 12:00 PM, she puts a single organism in a container. At precisely 1:00 PM, the container is full.

At what time was the container half full?

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pnikam Expert
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• At a bar, there is a bucket containing ice, some of which has melted. A bartender gets an ice cube weighing 20 grams from the ice bucket and puts it into an insulated cup containing 100 grams of water at 20 degrees Celsius. Will the ice cube melt completely? What will be the final temperature of the water in the cup?

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pnikam Expert
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• The path to enlightenment lies behind one of two doors. In front of each door stands a guard who knows which door leads to enlightenment, but one of the guards always lies and the other one always tells the truth. In your search for enlightenment, you are allowed to ask one guard only one question that can be answered “yes” or “no”, but unfortunately, you do not know which guard is the liar. You will be banished to the dungeon of logical illiteracy if you fail in your quest. What question should you ask to find the path to enlightenment?

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pnikam Expert
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• New Orelans was founded in 1718, over 290 years ago. Hurricane Katrina brought flooding and devastation to New Orleans in 2005. The levees separating Lake Pontchartrain and Lake Borgne from New Orleans have been repaired, but the city remains at risk because many areas are at or below sea-level. Taking into consideration that global warming is melting the Arctic ice, how likely is it that New Orleans will still be inhabitable in the year 2100?

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pnikam Expert
• 789.1K views

• A bear walks south for one kilometer, then it walks west for one kilometer, then it walks north for one kilometer and ends up at the same point from which it started. What color was the bear?

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pnikam Expert
• 789.1K views