• Brain Teasers & Puzzles

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    • An old farmer died and left 17 cows to his three sons. In his will, the farmer stated that his oldest son should get 1/2, his middle son should get 1/3, and his youngest son should get 1/9 of all the cows. The sons, who did not want to end up with half cows, sat for days trying to figure out how many cows each of them should get.

      One day, their relative came by to see how they were doing after their father’s death. The three sons told him their problem. After thinking for a while, the relative said: “I’ll be right back!” He went away, and when he came back, the three sons could divide the cows according to their father’s will, and in such a way, that each of them got a whole number of cows.

      What was the relative’s solution?

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    • Every day, John takes the train to travel from his work back to Mexico City, his place of residence. Usually, he arrives at the station of Mexico at six o’clock, and exactly at that moment, his wife picks him up by car. Yesterday evening, John took an earlier train, without informing his wife, and therefore he already was at the station of Mexico at five o’clock. He decided to walk part of the way to meet his wife. When he met the car with his wife, he drove home with her. In this way, they were home ten minutes earlier than normal. John’s wife always drives the entire way between home and station at the same constant speed.

      How long did John walk yesterday evening?

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    • John is on a dangerous adventure in the jungle. Suddenly an extremely poisonous snake bites him. Luckily, he has his medicines with him against this deadly snake poison: two bottles, labelled A and B, containing three pills each. Exactly three times, with an interval of 2 hours, he needs to swallow simultaneously both a pill A and a pill B. In a rush, he takes a pill from bottle A and then shakes a pill from bottle B with it. However, unfortunately two pills B fall from the bottle and they look completely identical to pill A. He cannot tell which of the three pills is A and which two are B. Stan is desperate: if he does not take the pills exactly as prescribed, it will be fatal.

      How can John survive?

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    • There are 10 bags, filled with marbles. The number of marbles in each bag differs, but all bags contain ten marbles or more. Nine of the ten bags only contain marbles of 10 grams each. One bag only contains marbles of 9 grams. In addition, you have a balance which can weigh in grams accurate, and you are allowed to use it only once (i.e. weigh a single time).

      How can you find out in one weighing, which bag contains the marbles of 9 grams?

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    • A boy leaves home in the morning to go to school. At the moment that he leaves the house, he looks at the clock in the mirror. The clock has no number indication and for this reason, the boy makes a mistake in interpreting the time (mirror image). Just assuming the clock must be out of order, the boy cycles to school, where he arrives after twenty minutes. At that moment, the clock at school shows a time that is two and a half hours later than the time that the boy saw on the clock at home.

      At what time did he reach school?

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    • The equation shown below is not correct:

      5 + 5 + 5 = 550

      Can you make the equation correct by placing just one stroke?

      (A hint : Putting a stroke through the equal sign is an inventive solution, but not the one we are looking for!)

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    • Army General, accused of high disloyalty, is sentenced to death by the court-martial. He is allowed to make a final statement, after which he will be shot if the statement is false or will be hung if the statement is true. General makes his final statement and is released.

      What could he have said?

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    • Two Egyptian camel drivers were fighting for the hand of the daughter of the sheikh of Arab. The sheikh, who liked neither of these men to become the future husband of his daughter, came up with a clever plan: a race would determine who of the two men would be allowed to marry his daughter. Therefore, the sheikh organised a camel race. Both camel drivers had to travel from Cairo to Abbudzjabbu, and the one whose camel would arrive last in Abbudzjabbu, would be allowed to marry the sheikh’s daughter.
      The two camel drivers, realising that this could become a rather lengthy expedition, finally decided to consult the Wise Man of their village. Arrived there, they explained him the situation, upon which the Wise Man raised his cane and spoke four wise words. Relieved, the two camel drivers left his tent: they were ready for the contest!

      Which four wise words did the Wise Man speak?

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