Take the world’s shortest IQ test here – 3 questions that can tell you how smart you are


An IQ test is a total score derived from several standardized tests designed to assess human intelligence.

They are popular with people looking to find out how “smart” they are, but they can be time consuming.

Typically, they focus on how the brain works and how different people approach a variety of tasks, challenges, and questions.

Recently there has been fascination in the media this week, especially in America, with what is called the “world’s shortest IQ test“.

His real name is Cognitive thinking test and it was first described in 2005 by a psychologist.

According to the online mirror, it consists of only three questions. Before telling you more, you can try below:

question 1

A bat and ball cost £ 1.10 in total. The bat costs £ 1.00 more than the ball. How much does the ball cost?

The options are: 15p, 10p and 5p.

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How much does the ball cost?


Chances are, you answered 10p for this question – a lot of people certainly do at first. This, however, is the wrong answer.

If the ball costs X – and the bat costs £ 1 more – then it can be calculated like this:

X + £ 1


Bat + ball = X + (X + 1) = 1.1


2X + 1 = 1.1 and 2X = 0.1

X = 0.05

question 2

If it takes five machines five minutes to create five widgets, how long would it take 100 machines to create 100 widgets?

The options are: 100 minutes, 50 minutes and five minutes.

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How long would it take the machines to craft 100 widgets?


It’s tempting, if you answer it quickly, to guess 100 minutes.

But this is not the correct answer.

Instead, if five machines can create five widgets in five minutes, one machine will also create a widget in five minutes.

Therefore, if we have 100 machines that all make widgets, they can make 100 widgets in five minutes.

question 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?

The options are: 24 days, 47 days and 36 days.

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How long does it take for the patch to cover half of the lake?


While many people may have responded within 24 days, the answer is as follows.

If the patch doubles in size every day in the future, its size will decrease by half back. So, on day 47, the lake is half full.

So how did you do it?

If you have understood all three correctly, then well done!

But please don’t worry if you are wrong, or in fact all of them. The objective of the test is to assess the ability of individuals to suppress an intuitive and spontaneous bad response, in favor of a good reflective and deliberative response.

So in theory, if you got it wrong, it’s only because you tried to answer a little too fast, and with a little more time you probably would have figured it out.


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