# Can YOU pass the world's shortest IQ test? Three questions can reveal if you have above average intelligence (but it's much harder than it looks)

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

They are popular among people looking to discover just how "clever" they are - but they can be lengthy.

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

Recently, there has been a fascination in the media this week, particularly in America, with what is being called the "world's shortest IQ test".

Its real name is the Cognitive Reflection Test and it was first described in 2005 by a psychologist.

According to the Mirror Online, it consists of just three questions. Before we tell you more about it, you can give it a go, below:

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**Question 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?

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

The odds are you answered 10p for this question - many 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 worked out like this:

X+£1

Therefore

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

Thus

2X+1=1.1, and 2X=0.1

X = 0.05

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**Question 2**

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

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

It's tempting, if answering these quickly, to guess 100 minutes.

But this isn't the right answer.

Instead, if five machines can make five widgets in five minutes, then one machine will make one widget in five minutes too.

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

#### Question 3

In a lake, there is a patch of lily pads. 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.

While many people might have answered 24 days, the answer goes as follows.

If the patch doubles in size each day going forward, it would halve in size going backwards. So on day 47, the lake is half full.

#### So, how did you do?

If you got all three right, then well done you!

But please don't worry if you got any wrong, or indeed all of them. The aim of the test is to assesses individuals' ability to suppress an intuitive and spontaneous wrong answer, in favor of a reflective and deliberative right answer.

So, in theory, if you got anything wrong, it's only because you were trying to answer a bit too quickly and, with a bit more time, you'd have probably figured it out.

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