Logic and Clear Thinking - 50 Brain Teazers

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One is not a nickel. Figure out what the coins are.

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An anthropologist studying a primitive tribe in a remote location in the Amazon basin, had uncovered a strange tribal custom. Whereby, if a husband found out his wife was unfaithful to him, he must execute her in a public ceremony in front of the whole tribe on the same day at midnight. It so happened that every man in the tribe knew about every cheating wife except his own, since telling a man about his cheating wife was against the tribal honor code. On the day of his departure, the anthropologist held a tribal meeting and made the announcement: "I know there are unfaithful wives in this tribe.

How many unfaithful wives were there? Find the mistake in these mathematical equations. Connect all 9 dots with 4 straight lines without lifting the pencil off the paper, and without going over the same line twice. Further Discussion. There is a complicated way counting a sequence. Of course, when the trains encounter, they will be approximately the same distance away from New York. The New York train will be closer to New York by approximately one train length because they're coming from different directions. That is, unless you take "meet" to mean "perfectly overlap".

This one has not standard solution. You can't reach the desired average speed under the given circumstances. It is easy to compare old and new perimeter - original perimeter is 2xPIxR, length of wire is 2xPIx new R and find out that the result is about 1.

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So a smaller man can go under it and a bigger man ducks. There are a few ways of solving this one. I like the following simple way of thinking. The given situation when the hour and minute hands overlay occurs in 12 hours exactly 11 times after the same time.

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There is no problem proving that the angle between the hours hand and the seconds hand is degrees. You can put one foot-bridge over one corner thus a triangle is created. Then from the middle of this foot-bridge lay another foot-bridge to the edge corner of the castle. You can make a few easy equations confirming that this is enough. There are 4 cars needed, including the car with the important letter which travels to the middle of the desert.

Its empty tank must be filled to the top to get to the end of desert. The way between the military base where the cars and petrol is and the middle of the desert can be divided into 3 thirds. This way the tank of the important car will be filled and the letter will be delivered. In the meantime, the aeroplane at the second third having full tank flies as far as it can so over the South Pole to the last third before the airport. The original length of belt was 96 cm. Add up all the injuries, and you find that soldiers suffered a total of injuries.

That total means that, at a minimum, soldiers it is, of course, not soldiers, but as calculation from person-injuries out of possible lost 3 body parts, and 10 the remainder when dividing by must have lost all 4 body parts. In reality, as many as 70 may have lost all 4 body parts. Another way to solve it is to draw a line of parts and compare injuries from opposite ends of the line, finding the intersection part of all 4 injuries. There is exactly as much tonic in the glass of fernet as there is fernet in the glass of tonic.

Of course, adding seven to five makes twelve and not thirteen. This was just a catch question. One of the coins is really not a nickel because nickel is the other coin. In the first crossing, one of each animal goes from east to west. In the second crossing, one wildebeest returns from west to east. Then on the third crossing, two lions cross from east to west.

One lion returns west to east. On crossing five, two wildebeest cross from east to west. On crossing six, one lion and one wildebeest return from west to east. On crossing seven, two wildebeest go from east to west. Now all three wildebeest are on the west bank, and the sole lion on the west bank rafts back to the east. From there crossings eight through eleven , lions simply ferry back and forth, until all the animals make it. I am marooned on an island with three watches, all of which were set to the correct time before I got stuck here.

One watch is broken and doesn't run at all. One runs slow, losing one minute every day. The final watch runs fast, gaining one minute every day. After being marooned for a moment, I begin to worry about timekeeping. Which watch is most likely to show the correct time if I glance at the watches at any particular moment? Which would be least likely to show the correct time? Answer : We know that the stopped watch must tell the correct time twice a day—every 12 hours. The watch that loses one minute per day will not show the correct time until days into its cycle of time loss 60 minutes in an hour times 12 hours , when it will momentarily be exactly 12 hours behind schedule.

Similarly, the watch that gains one minute a day is also wrong until days after its journey into incorrectness, when it will be 12 hours ahead of schedule. Because of this, the watch that doesn't run at all is most likely to show the correct time. The other two are equally likely to be incorrect. In this riddle, erroneously attributed to Albert Einstein, you're presented with a series of facts and must deduce one fact that's not presented. In the case of the video below, a fish has been kidnapped. There are five identical-looking houses in a row numbered one through five , and one of them contains the fish.

Watch the video for the various bits of information about the occupants of each house, the rules for deducing new information, and figure out where that fish is hiding!

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Note: You really need to watch the video to understand this one, and the list of clues is helpful too. Three castaways and a monkey are marooned together on a tropical island. They spend a day collecting a large pile of bananas, numbering between 50 and The castaways agree that the next morning the three of them will divide up the bananas equally among them. During the night, one of the castaways wakes up. He fears that the others might cheat him, so he takes his one-third share and hides it.

Since there is one banana more than a quantity which could be divided equally into thirds, he gives the extra banana to the monkey and goes back to sleep. Later in the night, a second castaway awakes and repeats the same behavior, plagued by the same fear. Again, he takes one-third of the bananas in the pile and again the quantity is one greater than would allow an even split into thirds, so he hands the extra banana to the monkey and hides his share.

Still later, the final castaway gets up and repeats the exact same procedure, unaware that the other two have already done it. Yet again, he takes a third of the bananas and ends up with one extra, which he gives to the monkey.

The monkey is most pleased. When the castaways meet in the morning to divide the banana loot, they all see that the pile has shrunk considerably, but say nothing—they're each afraid of admitting their nighttime banana thievery. They divide the remaining bananas three ways, and end up with one extra for the monkey.

Given all this, how many bananas were there in the original pile? Note: There are no fractional bananas in this problem. We are always dealing with whole bananas. Answer : Note that if the pile were bigger, the next possible number that would meet the criteria above would be —but that's outside the scope listed in the second sentence "between 50 and " of the puzzle. In the video below, a virus has gotten loose in a lab. The lab is a single story building, built as a 4x4 grid of rooms, for a total of 16 rooms—15 of which are contaminated.

The entrance room is still safe.

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There's an entrance at the northwest corner and an exit at the southeast corner. Only the entrance and exit rooms are connected to the outside. Each room is connected to its adjacent rooms by airlocks. Once you enter a contaminated room, you must pull a self-destruct switch, which destroys the room and the virus within it—as soon as you leave for the next room.

You cannot re-enter a room after its switch has been activated. If you enter via the entrance room and exit via the exit room, how can you be sure to decontaminate the entire lab? What route can you take? See the video for a great visual explanation of the problem and the solution.

  1. A subtle theft!
  2. 1. The “How Many [Things] Are There in [Location]?” Question.
  3. La pipe cassée (French Edition).
  4. Logic and Clear Thinking - 50 Brain Teazers Logic and Clear Thinking - 50 Brain Teazers
    Logic and Clear Thinking - 50 Brain Teazers Logic and Clear Thinking - 50 Brain Teazers
    Logic and Clear Thinking - 50 Brain Teazers Logic and Clear Thinking - 50 Brain Teazers
    Logic and Clear Thinking - 50 Brain Teazers Logic and Clear Thinking - 50 Brain Teazers
    Logic and Clear Thinking - 50 Brain Teazers Logic and Clear Thinking - 50 Brain Teazers
    Logic and Clear Thinking - 50 Brain Teazers Logic and Clear Thinking - 50 Brain Teazers

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