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"Logic Riddles"

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friday

there is a man named joe. He and his horse went to stay in a hotel and he left to the hotel on monday. He stayed at the hotel with his horse for two days and he came straight back home on friday. How is this possible?

A:
The horses name is friday
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A bus driver

Abus driver was going down the street.He was on the wrong side.He went at a stop sign and didn’t signal at a turn.He went under the minimum speed and yet he did not get in trouble for his actions.How is this possible?

A:
He was a bus driver but he was only walking!
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The Decesion

You only have one match, and your electricy and heat are out of order, you have a kerosine heater, a fireplace, and a kerosine lamp. What do you lite first?

A:
the match
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Three hats

The three wisest sages in the land were brought before the king to see which of them were worthy to become the king’s advisor. After passing many tests of cunning and invention, they were pitted against each other in a final battle of the wits.

 

Led blind-folded into a small room, the sages were seated around a small wooden table as the king described the test for them.

 

“Upon each of your heads I have placed a hat. Now you are either wearing a blue hat or a white hat. All I will tell you is this- at least one of you is wearing a blue hat. There may be only one blue hat and two white hats, there may be two blue hats and one white hat, or there may be three blue hats. But you may be certain that there are not three white hats.”

 

“I will shortly remove your blind folds, and the test will begin. The first to correctly announce the color of his hat shall be my adviser.  Be warned however, he who guesses wrongly shall be beheaded. If not one of you answers within the hour, you will be sent home and I will seek elsewhere for wisdom.”

 

With that, the king uncovered the sages’ eyes and sat in the corner and waited. One sage looked around and saw that his competitors each were wearing blue hats. From the look in their eyes he could see their thoughts were the same as his, “What is the color of my hat?”

 

For what seemed like hours no one spoke. Finally he stood up and said, “The color of the hat I am wearing is…”

A:
..."Blue." At first glance, this problem appears to be impossible to solve. Contributing to this is the feeling that the King's only real clue- that there is at least one blue hat- is useless since the sage can clearly see that there are at least two blue hats.

Don't feel bad if you sat stuck on this one for a while: as the puzzle clearly states, so did the three wisest sages in the kingdom. It is this fact that allowed our sage to give his answer. In truth, any one of them would have come up with it, given enough time. Why?

Consider a situation which we knew was not the case- that there was exactly one blue hat. What would happen? There would be a split second of pondering by the person wearing that hat, and he would say "I am wearing a blue hat." No real puzzle there, but of course there wasn't just one blue hat. The important fact is that everyone knew there was not one blue hat. But more importantly than that, everyone knew, or could quickly figure out that everyone else knew this (by the fact that answer was did not come out in the first few seconds.)

This leaves everyone wondering, "Are there two or three blue hats?"

Consider this less obvious situation- that there were exactly two blue hats. This seems a very real possibility at first, after all, we can see exactly two blue hats. So everyone sits and thinks- for a little while. But if there are only two hats, then two people see one blue and one white hat. These two people will very quickly, by virtue of the other's silence, rule out the possibility that there is only one blue hat. One of these two lucky sages would cry blue within a few short minutes, if that long.

There is only one case which forces the three sages to sit in silence- three blue hats. Our sage, through his sharp wits was the first to reach this conclusion.
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Will you marry me?

Does the Moslem religion allow a man to marry his widow?s sister?

A:
Can a dead man marry? His widow would mean he is dead.
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Add it up

Two American coins add up to thirty cents, but one of them is not a nickel. What coins are they?

A:
A quarter and a nickel. One of them is not a nickel, and that?s the quarter.
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Which bear?

A man is 100 meters due South of a bear. He walks 100 yards due East, then faces north, fires his gun due north, and hits the bear. What color is the bear?

A:
White. It?s a polar bear. Only in the North Pole are all directions to the South.
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Thin dog, Fat dog

Two dogs are sitting on a porch – a fat dog and a thin dog. The little dog is the son of the fat dog, but the fat dog is not the father of the thin dog. Can you explain?

A:
The fat dog is the mother.
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That man’s father

A man was looking at a portrait. Someone asked him, “Whose picture are you looking at”. He replied: “Brothers and sisters have I none, but this man?s father is my father?s son.” Who is in the picture?

A:
The man is looking at a picture of his son.

Careful analysis of the statement, "Brothers and sisters I have none, but this man's father is my father's son", will reveal this to be the case. It is not possible that he could be looking at a picture of himself. The main phrase is, "That man's father is my father's son." Which means: "That man's father is me." (Your "father's son" is yourself if you have no brothers or sisters, as the puzzle says.) Making it even simpler, it means, "I am that man's father". Therefore, he is looking at his son.
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Smart Solutions

Before airplanes were invented, a suspension bridge was being planned to span the gorge near Niagara Falls. There was no way a boat could carry the necessary suspension cables across the violent water, and the bridge could not be built until the cables spanned the river. One day the builders staged a contest open to the public that solved their problem. The contest was won by a young boy. Shortly thereafter, the cables spanned the water. What countries did they stage and how did they use it to solve their problem?

A:
The builders of the bridge were inspired to offer a prize to the first person to fly a kite from the American side to the Canadian side. Once the kite string made the crossing, a heavier cord was tied to this string and it was pulled across. This process continued in succession using heavier cords and ropes until the first cable spanned the river.
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