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13 brain teasers to make you think hard and to boost your brain power

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  • 13 brain teasers to make you think hard and to boost your brain power

    1. A box contains 12 balls of three different colors. 4 each of red, yellow and blue. If you were to be blindfolded and asked to pick them at random, How many balls must you pull out to be sure that there are at least two of one color among the balls picked out?


    2. In a training academy, Mark is the 50th fastest and the 50th slowest runner. Assuming no two runners, run at the same speed, how many runners are in Mark’s academy?


    3. Benjamin had locked his suitcase with a 3-digit numerical code. He normally forgets his codes, so he wrote some clues indicating the what the code was. Can you crack the code based on the 5 clues written below by Benjamin?

    Clue #1: 082 – One number is correct and well placed

    Clue #2: 013 – One number is correct but wrongly placed

    Clue #3: 260 – Two numbers are correct but both are wrongly placed

    Clue #4: 748 – None of the numbers are correct

    Clue #5: 786 – One number is correct but wrongly placed


    4. My daughter has many sisters.

    She has as many sisters as she has brothers.

    Each of her brothers has twice as many sisters as brothers.

    How many sons and daughters do I have?


    5. Pamela is trying to lose some weight.

    She wants to do this by climbing stairs.

    She starts on the fourth floor, climbs up five stories, down seven, up six, down three, and up four again.

    What floor is she on now?


    6. Jennifer is packing gifts and wants 200 ribbons of length 110 cm each.

    If each tape contains 25m of ribbon, how many tapes will Jennifer need?


    7. 3 competitors Frank, Bruce, and Jack go on an expedition in the forest. They find a magic lamp in one of the caves in the forest. As they rub the lamp a genie pops out and grants them 1 wish each.

    Frank goes first, “I wish I could be alive forever.”

    Bruce goes next, “I wish the word ‘alive’ actually meant ‘dead’”.

    Jack goes last, “I wish Bruce and Frank were dead”.


    After all, is said and done, who of the three is alive and who is dead?


    8. 20 people worked and earned $20 between them.

    The workers include men, women, and children.

    If each man earns $ 3, each woman $1.50 and each child earns $ 0.50.

    How many men, women, and children are there?


    9. In an athletic race, the woman who came two places in front of the last woman finished one ahead of the woman who came fifth. How many competitors were running the race?


    10. Your friend puts a coin in a wine bottle and then puts in the cork to close it. He now asks you to remove the coin from the bottle, but the conditions are that you cannot; take out the cork or Break the bottle. How would you remove the coin?


    11. A man has Ten Horses and nine stables as shown here.

    [] [] [] [] [] [] [] [] []

    The man wants to fit Ten Horses into nine stables. How can he fit Ten horses into nine stables?


    12. A school orchestra with 10 musicians can play the first section of a symphony in 10 minutes. How long would it take to play if they added 10 more musicians to the orchestra?


    13. Mark is throwing his son Stewart a surprise birthday party but he has limited funds.

    He spent half of his money plus $2.00 on the cake.

    Half of what was left plus $2.00 was spent on balloons and decorations.

    Then he spent half of what he had left plus $1.00 on candy.

    Now he is out of money, how much did Mark start with?

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