Can you pass the world’s shortest IQ test?


These questions even baffled students at Yale and Harvard.

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So, you could have a dark sense of humor or fail your driving test, all signs of intelligence, according to science. But how smart are you, really? The Cognitive Reflection Test (CRT), also known as the world’s shortest IQ test, claims that it only takes three questions to tell if you’re a genius.

Developed in 2005 by Princeton psychologist Shane Frederick, the quiz assesses your ability to process information slowly and rationally, rather than jumping to quick conclusions. “To be successful at CRT, you need to spend time thinking about your answer and questioning your intuitive answer” IFL Sciences Explain.

Before we start, we’ll give you a little hint: the questions may not be as straightforward as they first appear. A 2005 study found that students attending some of the country’s most prestigious universities (including Harvard and Yale) failed to answer all three questions correctly; only 17 percent received a perfect score. here is 14 brain exercises that can make you smarter.

Think you have what it takes? Give it a shot! Here are the three questions:

1. A bat and a ball cost $ 1.10 in total. The bat costs $ 1 more than the ball. How much does the ball cost?

2. If it takes 5 machines 5 minutes to create 5 widgets, how long would it take 100 machines to create 100 widgets?

3. In a lake, there is a square of water lilies. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?

Check out the answers below, and good luck! By the way, see if you have these weird habits prove you’re smarter than most.


  1. $ 0.05. If you guessed 10 cents, you are not alone. However, if that was the case, the bat and ball would cost $ 1.20, not $ 1.10. On the other hand, buying a 5-cent ball and a bat priced at $ 1.05 (which is $ 1 more than 5 cents) would instead total $ 1.10.
  2. 5 minutes. Although you might have answered 100 minutes, the actual time is a little less than that. Since the question reveals that it would take 1 widget machine 5 minutes to create 1 widget, you can determine that it would take 100 widget machines 5 minutes to create 100 widgets.
  3. 47 days. At first, your gut might tell you it would take 24 days. But remember: since the area of ​​the lake covered in water lilies doubles every day, a patch that covers half of the lake would cover all of it in a single day. Subtract a day from 48 days, and what do you get? 47 days.

Then take this Mensa quiz to find out if you really are a genius.

[Source: IFL Science]


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