Author: Jaume

  • Easy Deduction

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    Jaume
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    A teacher thinks of two consecutive numbers between 1 and 10. The first student knows one number and the second student knows the second number. The following exchange takes place:First: I do not know your number.Second: Neither do I know your number.First: Now I know.What are the 4 solutions of this easy number puzzle?

  • Birthday

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    Jaume
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    The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year.What day is my birthday?

  • Water bowls 2

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    Jaume
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    Given three bowls: 8, 5 and 3 liters capacity, divide 8 liters in half (4 + 4 liters) with the minimum number of water transfers. Note that the 8-liter bowl is initially filled with 8 liters of water and the other two bowls are empty – that is all water you have.

  • Water bowls 1

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    Jaume
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    If you had a 5-liter bowl and a 3-liter bowl, and an unlimited access to water, how would you measure exactly 4 liters?

  • Cannibals and Missionaries

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    Jaume
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    Three missionaries and three cannibals want to get to the other side of a river. There is a small boat, which can fit only two. To prevent a tragedy, there can never be more cannibals than missionaries together.

  • She-goat, Wolf and Cabbage

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    Jaume
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    A farmer returns from the market, where he bought a she-goat, a cabbage and a wolf. On the way home he must cross a river. His boat is small and won’t fit more than one of his purchases. He cannot leave the she-goat alone with the cabbage (because the she-goat would eat it), nor he…

  • Double Liar Paradox (Jourdain’s paradox)

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    Jaume
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    The following is written on opposite sides of a card: Front side:THE SENTENCE ON THE OTHER SIDE OF THIS CARD IS FALSE. Back side:THE SENTENCE ON THE OTHER SIDE OF THIS CARD IS TRUE.

  • Liar Paradox (Epimenides Paradox)

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    Jaume
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    If someone says “I always lie”, are they telling the truth? Or are they lying?

  • Fly and trains

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    Jaume
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    Two trains, 200 km apart, are moving toward each other at the speed of 50 km/hour each. A fly takes off from one train flying straight toward the other at the speed of 75 km/hour. Having reached the other train, the fly bounces off it and flies back to the first train. The fly repeats…

  • Brick weight

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    Jaume
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    One brick is one kilogram and half a brick heavy.What is the weight of one brick?