MATH RIDDLES

Fun Facts (Hints)

Different types of riddles have challenged people for centuries, here are a few facts about them that may give you some hints in solving these challenging questions:
  • Riddles in math are used by math teachers in many different cultures.
  • Many teachers promote the idea that giving students mathematical riddles helps to encourage their pupils to think more creatively and strategically.
  • These riddles are considered especially helpful in classrooms where students have emotional problems, as it pulls them away from their problems, and forces them to think creatively about what is before them.
  • Detectives are sometimes forced to solve riddles involving math when searching for psychopaths and serial killers.
  • Math riddles are used at home by many parents seeking to help their students become more engaged in their math schoolwork/homework.
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    Riddles and Answers © 2019

    What Are The Coins?

    Hint:
    A nickel and a quarter: one of them isn't a nickel but the other one is
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    The 100 Pound Watermelon

    Hint:
    50 pounds.

    In the beginning it is 99 pounds water and 1 pound other stuff. At the end the 1 pound other stuff is 2 percent so the total weight is 50 pounds. 50 pounds - 1 pound other stuff = 49 pounds water. So 99 pounds - 49 pounds = 50 pounds water lost.
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    How Old Could He Be?

    Hint:
    He was 44 years old.

    From the question you know the man died between 1900 and 1940. We also know his age at death (x) is one twenty-ninth of the year of his birth (29x). If you add his age at death to the year he was born you get the year he died (30x). Only one year between 1900 and 1940 is divisible by 30, 1920 (the year he died). The year he was born can now be found: 1920 * (29/30) = 1856. So in 1900 he was (1900 - 1856) = 44 years old.
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    Whats The Temperature?

    Hint:
    273.15 degrees Celsius. When making conversions like this you must convert to the Kelvin scale since it is the only one that works on a scale beginning with 0.
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    The Broken Grandfather Clock

    Hint:
    He made it run backwards.
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    YES  NO  

    1 Year Of Chickens

    Hint:
    It is impossible to know because the chicken's babies could also have babies during this time.
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    YES  NO  

    Which Is Correct?

    Hint: What is 9 plus 5?
    Neither. 9 and (plus) 5 is 14, not 13.
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    A Nose That Grows

    Hint:
    For every pair of a truth and a lie his nose will shrink to 75 percent of its previous size prior to this truth and lie. So the correct answer is 0. As the number of times he tells a lie and the truth ((3/4)n) approaches infinity the length of his nose approaches 0.
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    How Many Times A Day?

    Hint:
    22 times: 12:00:00, 1:05:27, 2:10:55, 3:16:22, 4:21:49, 5:27:16, 6:32:44, 7:38:11, 8:43:38, 9:49:05, 10:54:33. Each twice a day.
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    A Knight To The Rescue

    Hint:
    He puts one plank across the corner of the square (where two sides meet) and puts the other perpendicular to it to form a 'T' shape in the corner allowing him to cross the moat and save his beloved.
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