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Can You Pass The World’s Shortest IQ Test ? Just 3 Questions Long

Want to know your IQ and don’t have much time to answer a dozen of questions? Try the world’s shortest IQ test called the Cognitive Reflection Test (CRT). It has only 3 questions.

CRT was developed in 2005 by Shane Frederick from Princeton and was published in the Journal of Economic Perspectives.

  • The test attempts to find out how you think: do you trust your gut feelings or do you take time to think rationally?
  • CRT identifies how good you are in intuitive thinking and analytical thinking.
  • However, getting all three answers correct is not the only parameter of having a higher IQ. Your speed of answering determines this too.
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Before proceeding to the test, just be careful. Don’t rush into answering the questions. Think clearly and use common sense.

Here are the 3 questions:

  • The total price of a bat and a ball is $1.10. The price of the ball is $1 more than the bat. So, what is the price of the bat?


  • 5 machines take 5 minutes to make 5 widgets. In order to have 100 widgets, how long will 100 machines take?


  • There is a patch of lily pads in a lake. The patch doubles in size every day. If the lake gets covered in 48 days, then how many days should it take to cover half of the lake?
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The correct answers are:

  • 5 cents.
  • 5 minutes.
  • 47 days.

How to solve them?

  • Let the cost of the ball be

Then, cost of the bat is x+$1.

Therefore, total cost= Bat+ Ball = x+ (x+1)= 1.10.


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So, the cost of the ball is 5 cents.

  • 5 machines make 5 widgets in 5 minutes.

Therefore, 1 machine will make 1 widget in 5 minutes.

Thus, 100 machines will make 100 widgets in 5 minutes.

  • The lily pad doubles in size every day. So, it will cover half of the pond in 47 days.


Usually, the most popular answers are:

  • 10 cents.
  • 100 minutes.
  • 24 days.

How many of these did you get correct?


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Emilia Gordon
Born and brought up in Kansas, Emilia is a writer and a social activist.She enjoys travelling and meeting new people
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