The simple riddle that 50% of Harvard students get wrong



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Sources
Cognitive reflection test
http://emilkirkegaard.dk/en/wp-content/uploads/Shane-Frederick-Cognitive-Re%EF%AC%82ection-and-Decision-Making.pdf

Cognitive reflection test and cognitive biases
http://www.keithstanovich.com/Site/Research_on_Reasoning_files/MC_2011.pdf

Font in cognitive reflection test
http://pages.stern.nyu.edu/~aalter/intuitive.pdf

Fonts in school
https://web.princeton.edu/sites/opplab/papers/Diemand-Yauman_Oppenheimer_2010.pdf

Fonts and cognitive strain
http://rady.ucsd.edu/faculty/seminars/2010/papers/oppenheimer.pdf

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Fahad Hameed

Fahad Hashmi is one of the known Software Engineer and blogger likes to blog about design resources. He is passionate about collecting the awe-inspiring design tools, to help designers.He blogs only for Designers & Photographers.

35 thoughts on “The simple riddle that 50% of Harvard students get wrong

  • September 23, 2017 at 1:37 am
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    Because not all harvard degrees mean something, that's why sometimes you'd hear someone say he got "a university_name degree" , excluding the important bit which is what type. They know that it's useless and easy.

    Reply
  • September 23, 2017 at 1:37 am
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    bat = x
    ball = y
    bat + ball = 1.1
    bat = ball + 1 => bat – ball = 1

    x + y = 1.1
    x – y = 1

    Row reduced echelon form of:
    | 1 1 1.1|
    | 1 -1 1 |
    row2 = row2 + (-1)*row1
    | 1 1 1.1|
    | 0 -2 -0.1|
    row2 = row2 / (-2)
    | 1 1 1.1|
    | 0 1 0.05|
    row1 = (-1)*row2 + row1
    | 1 0 1.05|
    | 0 1 0.05|
    bat = 1.05
    ball = 0.05

    Reply
  • September 23, 2017 at 1:37 am
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    The first question doesn't make sense. You said that it cost 1 dollar more than the ball not more than 1 dollar? Since there is 1$ difference it would be 1.00$ + 0.5$, but if you had said that the difference between the prices is over 1$ then the answer could be practically

    Reply
  • September 23, 2017 at 1:37 am
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    People reading harder fonts have to spend more time on it, naturally they consume more time and take more time to memorize it.

    Reply
  • September 23, 2017 at 1:37 am
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    ok like riddle 2 is soo easy.

    5 machines 5 mins 5 widgets

    100 machines 5 mins 100 widgets

    its not the sum, its the duration :0

    in the 3rd riddle:

    a patch of lily pads hmm

    1
    if it takes 48 days to fill the whole lake
    but it doubles per day
    and it asks how many days will it take to reach half,
    then i would say it takes 47 dayes 🙂

    Reply
  • September 23, 2017 at 1:37 am
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    AHHH YESS i got it correct right away!
    im not a teenager yet

    i knew that if the base ball is 10 cents then the bat is 110 cents, which doesnt add up to 10

    but since 5+5 = 10, then i tryed 0.05 + 1.05 = 1.10
    yes!

    Reply
  • September 23, 2017 at 1:37 am
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    One minute is the answer. One machine working one minute makes one widget. Therefore 100 machines, each working one minute, make 100 widgets. Birmingham, MI Middle School and High School Writing and Math Tutor (The other answers are 5 cents, and 46 days.)

    Reply
  • September 23, 2017 at 1:37 am
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    I'm literally in vitro and got this right. Due in six weeks. Wish me luck, everyone!

    Reply
  • September 23, 2017 at 1:37 am
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    Let x be the cost of bat and y be the cost of ball
    x + y = $1.10 (Equation 1)
    x – y = $1 (Equation 2)
    Subtract the two equations, we get:
    2y = $0.10
    Therefore, y = $0.05

    Reply
  • September 23, 2017 at 1:37 am
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    I said$0.04 because I was adding taxes I guess if you really think about it I was right

    Reply
  • September 23, 2017 at 1:37 am
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    What was so hard abt thevquestions.. are the masses really that dumb

    Reply
  • September 23, 2017 at 1:37 am
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    I was actually upset when I said 5 right at the beginning and the dude was like you said 10 right? I was saying " NO THAT'S WRONG!"

    Reply
  • September 23, 2017 at 1:37 am
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    the only reason why i thought more about that initial question was because of all the professor layton games ive played recently.

    Reply

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