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IQ Riddle

IQ Riddle - 20 January

It's a test that will check your IQ.
Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?


For Solution : Click Here

13 comments:

  1. Fill the 11, pour it into the 13. Refill the 11, and then pour the 11 into the 13 until it's full. There is now 9 left in the 11; empty the 13 and pour the remaining 9 back into the 13. Fill the 11 once again and pour it to fill the 13. You will have 4 left in the 11, and then you place that 4 into the 13 and fill up the 11. 11+4=15

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  2. Fill the 11 minute one, then divide the 13 minute one into 13 imaginary parts and fill 2 of the 13 parts.

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  3. start 11 and 13 in the same time. when the 11 finish place it reverse till the 13 ends.so that the bottom of the 11 have two minute.then just reverse the 11 . so13+2 equels 15

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  4. reverse both. when 11 finishes, 2 remains in 13. reverse them both again, until the 2 in 13 finishes. then reverse the 11 one again, since it has 2. 11 + 2 + 2 = 15

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  5. Start both. When 11 finishes, flip it. When 13 finished, flip 11 again. When 11 ends it's 15 minutes

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    Replies
    1. Define "Best" please. This one requires more flips which means you get less accuracy. Would you mind explaining your input Scott and Anonymous? Thanks.

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  6. No need to flip 11 twice. We flip the 11 and 13 simultaneously. As soon as the 11 is done, there are 2 minutes remaining on the 13. So we start our time at that point, flip the 13 over again, and when the 13 is done, you have your 15 minutes. I think.

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    Replies
    1. I think this is the best answer. There are less lips which mean you get more accuracy that way.

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  7. A teacher was having trouble getting her students to learn their facts, but she noticed that her students often played the game "Rock, Paper, Scissors". She made a game with similar rules in order to encourage the students to learn their facts.

    The class would be divided into three teams: Rock, Paper and Scissors. The teacher would ask the students a question and the class would raise their hands if they knew the answer. If the first person to answer the question correctly is in the Rock team, he or she would choose one player from the Scissors team to be eliminated. Similarly, if a player from the Scissors team was first to answer the question, then he or she would eliminate a member from the Paper team. Lastly, if a player from the Paper team was first to answer correctly, he or she would eliminate a member from the Rock team.

    The teacher would then continue asking questions until only one team still has members. That team would be declared the winner and all its members would win a small chocolate.

    However, as soon as she explained the rules to the class, one particularly smart student immediately found a large flaw that made the game unplayable. Can you do the same?

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    Replies
    1. If your team answers the most questions correctly, then the team who is beating your opponents has been eliminated. Therefore, you will eventually lose.

      For example, if the rock team completely eliminates the scissors team, then only paper is left, and the paper team will slowly win by eliminating all of the rocks. The rock team would find it impossible to win.

      Therefore, the best strategy is to answer no questions hoping your nemesis team is eliminated first. If no students answer questions, the game cannot progress.

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  8. Fill 13 first, pour into 11, 2 left in 13. Throw 11. Poor the remaining of 13 into 11. 11 contain 2. Fill 13 completely. 2+13=15

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