MATH BRAIN TEASERS

Fun Facts (Hints)

Mathematics has an extensive history in just about every culture or civilized society known to man. Listed below are some cool facts to get those math juices flowing:
  • In 1852 mathematician JJ Sylvester established the "theory of algebraic invariants."
  • In 1995 math great Andrew Wiles, proved "Fermat's Last Theorem."
  • The first decimal number system is said to have been invented in Ancient Egypt around 5000BC.
  • The Ancient Mayan civilization located in Central America is one of the only cultures in the recorded history of the world to use a place-value number system.
  • The American Mathematical Society was formed in the late months of 1888 in New York.
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    Riddles and Answers © 2019

    The Non Digital Clock Riddle

    Hint:
    The hour hand will have moved one-fourth of an hour; therefore, there will be 7.5 degrees between the two hands.
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    150 Pens Riddle

    Hint:
    She has misplaced 119 pens in total.
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    The Jug Full Of Beer

    Hint:
    First fill the 8 liters jug complete - 4, 8, 0
    Fill the 5 liters jug with 8 liters jug - 4, 3, 5
    Pour back the beer from 5 liters jug to 12 liters jug - 9, 3, 0
    Pour the 3 liters from 8 liters jug to 5 liters jug - 9, 0, 3
    Fill the 8 liters jug completely from 12 liters jug - 1, 8, 3
    Fill the 5 liters jug from the 8 liters jug - 1, 6, 5
    Pour the entire 5 liters jug back in 12 liters jug - 6, 6, 0

    You have successfully split the beer into two equal parts.
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    A Large Box Of Money Riddle

    Hint:
    Just one, after which it will no longer be empty.
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    Filling Your Buckets Riddle

    Hint:
    Fill the 5 gallon bucket all the way up. Pour it into the 3 gallon bucket until it is full. Empty the 3 gallon bucket. Pour the remaining 2 gallons into the 3 gallon bucket. Fill the 5 gallon bucket all the way up. Finish filling the 3 gallon bucket.
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    Feet In A Yard Riddle

    Hint:
    3.
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    Making Ten Riddle

    Hint:
    Yes it is possible in Roman Numerals. In Roman Numerals,
    9 = IX
    10 = X
    11 = XI

    Thus by removing one from 9, you are getting 10 and by removing one from 11, you are getting 10 again.
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    Zebras And Ostriches In The Zoo

    Hint:
    The number of Ostriches = 60 & The number of Zebras = 20
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    The Greater Dozen Riddle

    Hint:
    Six Dozen Dozen
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    A Rickety Bridge Riddle

    Hint:
    17 mins.

    The initial solution most people will think of is to use the fastest person as an usher to guide everyone across. How long would that take? 10 + 1 + 7 + 1 + 2 = 21 mins. Is that it? No. That would make this question too simple even as a warm up question.

    Let's brainstorm a little further. To reduce the amount of time, we should find a way for 10 and 7 to go together. If they cross together, then we need one of them to come back to get the others. That would not be ideal. How do we get around that? Maybe we can have 1 waiting on the other side to bring the torch back. Ahaa, we are getting closer. The fastest way to get 1 across and be back is to use 2 to usher 1 across. So let's put all this together.

    1 and 2 go cross
    2 comes back
    7 and 10 go across
    1 comes back
    1 and 2 go across (done)

    Total time = 2 + 2 + 10 + 1 + 2 = 17 mins
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