Try the world’s shortest IQ test with just three questions – but 80% fail


Since the lockdown started, we’ve noticed everyone’s love for quizzes and testing their brain power, and we’ve got another tough one to try.

Have you ever wondered what your IQ is but never had the patience to take a long test? Then you can now find out in a few minutes.

Most IQ tests have endless questions and can take hours, so if you don’t like these we can have the perfect solution for you.

The world’s shortest IQ test. But make no mistake, it’s as hard as the others.

The IQ test consists of just three math questions and shouldn’t take too long.

Originally published in 2005 by Professor Shane Federick, as part of a research paper titled Cognitive Reflection Test, it has resurfaced online with those who want to discover their intelligence, according to The mirror.

The study had 3,000 participants from a variety of educational backgrounds, including students from Harvard and Yale universities.

However, only 17 percent managed to get a score of three out of three, which resulted in 83 percent of people failing. But do you want?

The author says, “The three elements of CRT are ‘easy’ in the sense that their solution is easily understood when explained, but achieving the correct answer often requires removing a wrong answer that comes ‘impulsively’ to. the mind. “

So, without further ado, scroll down to find the questions, answers, and the theory behind them.


The test consists of three math questions

(1) A bat and a ball cost $ 1.10 in total. The bat costs $ 1.00 more than the ball. How much does the ball cost? _____ cents

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

(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? _____ days

The article quotes Jensen, 1998, and says: “People with higher cognitive abilities (or ‘IQs’) differ from those with lower cognitive abilities in a number of important and unimportant ways.

“On average, they live longer, earn more, have greater working memory, faster reaction times, and are more sensitive to visual illusions.”

How do you think you got out of it?

The most common incorrect answers:

1.10 cents

2.100 minutes

3. 24 days

Professor Frederick continued, “Anyone who thinks about it for a moment would agree that the difference between $ 1 and 10 cents is only 90 cents, not $ 1 as the problem states.

“In this case, detecting this error is tantamount to fixing the problem, because almost everyone who does not answer” ten cents “does, in fact, give the correct answer.”

The correct answers:

1.5 cents

25 minutes

3. 47 days

You can read on the full test and paper here.

The answers explained:

If you’re as confused as we are, luckily Presh Talwalkar, from The Joy of Game Theory: An Introduction to Strategic Thinking, explains the answers on his Blog.

1. Suppose the ball costs X. Then the bat costs $ 1 more, so it’s X + 1. So we have bat + ball = X + (X + 1) = 1.1 because together, they cost $ 1.10. This means 2X + 1 = 1.1, then 2X = 0.1, so X = 0.05. This means the ball costs 5 cents and the bat costs $ 1.05

2. If it takes five machines 5 minutes to create five widgets, then it takes a machine 5 minutes to create a widget (each machine makes a widget in 5 minutes). If we have 100 machines working together, each one can create a widget in 5 minutes. So there will be 100 widgets in 5 minutes.

3. Each day the patch doubles in size. So, every BACKWARDS day means that the patch size decreases by half. So, on day 47, the lake is half full.


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