The world’s shortest IQ test: find out how smart you are in just three questions

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Ever since American psychologist Lewis Terman tinkered with Stanford-Binet intelligence scales in 1916, the IQ test has been considered the barometer of intelligence.

These are often a long series of questions that can sometimes test your patience as well as your thinking skills.

While an IQ test will give a more accurate measure of your intelligence, The mirror reported that there’s a way to see how energized you are today – in just three questions.



Did you take an IQ test?

The cognitive reflection test (CRT)

The CRT only includes three questions, but you only need to assess how accurately you can answer a question that is actually more difficult than it first appears.

The idea is that the faster you can do it, the smarter you seem to be.

Let us know in the comments section below how you are doing.

Good luck.

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?

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How much does the ball cost?



It wouldn’t be a surprise if you answered 10 pence for this question, because that’s what it would lead you to believe.

Unfortunately, this is the wrong answer and that is why;

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

X + £ 1; So – Bat + ball = X + (X + 1) = 1.1

So – 2X + 1 = 1.1 and 2X = 0.1

So – X = 0.05

Well done if you have that one in the bag. Now let’s move on to the next one;



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IQ Test – Can You Solve It?

question 2

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

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



Of course, it is easy to choose 100 minutes as the answer, but that would be wrong.

Once that’s explained, it looks very easy. Basically, if five machines can create five widgets in five minutes, one machine will also create a widget in five minutes.

This means that if 100 machines all made widgets, then they can create 100 widgets in five minutes.

So far, so good? Just one more to go.

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?

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



What did you answer? It’s easy to plump up for 24 days because that seems like the obvious answer.

Unfortunately, this is wrong and the correct 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.

Did you understand the three correctly? Of course, there is always the caveat that this is not an IQ test that you can bet your house on.

If you have three out of three, it’s definitely worth commending.


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