# The simple riddle that 50% of Harvard students get wrong

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Sources
Cognitive reflection test

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

source

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

• September 23, 2017 at 1:37 am

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.

• September 23, 2017 at 1:37 am

I got it right… all i can say now is: neat

• September 23, 2017 at 1:37 am

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

• September 23, 2017 at 1:37 am

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

• September 23, 2017 at 1:37 am

• September 23, 2017 at 1:37 am

I guessed five… That make me the more intelligent half of Harvard? Do I get in?

• September 23, 2017 at 1:37 am

People reading harder fonts have to spend more time on it, naturally they consume more time and take more time to memorize it.

• September 23, 2017 at 1:37 am

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 🙂

• September 23, 2017 at 1:37 am

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!

• September 23, 2017 at 1:37 am

the 50% are the "diverse" students

• September 23, 2017 at 1:37 am

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.)

• September 23, 2017 at 1:37 am

I came for a riddle, not this bullshit

• September 23, 2017 at 1:37 am

I'm literally in vitro and got this right. Due in six weeks. Wish me luck, everyone!

• September 23, 2017 at 1:37 am

cries heart out i should have answered more carefully

• September 23, 2017 at 1:37 am

Those questions were easy what the hell

• September 23, 2017 at 1:37 am

But technically there still right

• September 23, 2017 at 1:37 am

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

• September 23, 2017 at 1:37 am

Is it bad that I said 45c to the bat and ball problem

• September 23, 2017 at 1:37 am

its the Einstellung effect..

• September 23, 2017 at 1:37 am

I got all three of them right

• September 23, 2017 at 1:37 am

Roses are red
Violets are blue
I got clickbated
And so do you

• September 23, 2017 at 1:37 am

i got all these rite and im only 3

• September 23, 2017 at 1:37 am

I said\$0.04 because I was adding taxes I guess if you really think about it I was right

• September 23, 2017 at 1:37 am

What was so hard abt thevquestions.. are the masses really that dumb

• September 23, 2017 at 1:37 am

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!"