Can you pass the world's shortest IQ test?

Taking a traditional IQ test can be a cumbersome experience when you’re faced with dozens of questions. Apparently, there’s a much easier way to test your IQ, with only 3 questions!

Talk about IQ scores in the media has been rife since President Trump challenged his Secretary of State, Rex Tillerson, to an IQ test. 

According to Mensa, the average IQ score is around 100. However, there is a much easier way to test your intelligence in just three questions.

The Cognitive Reflection Test, penned in 2005 by Psychologist Shane Frederick, is designed to measure a person’s tendency to override an incorrect “gut” response and engage in further reflection to find a correct answer.

Those with a higher score on the CRT are thought to be more patient and less likely to take risks. In a survey of over 3,000 people, over 33% got all answers incorrect. Most people (83%) also missed at least one of the questions.

So how do you compare? Have a go at the questions below, if you get more than 2 out of 3 right, you’re apparently more intelligent than the general population. 

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?

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

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 the lake?

Scroll down for the answers


Quick Answers:

1. 5p (not 10p)

2. 5 minutes (not 100)

3. 47 days (not 24)

Longer explanation:

 1. If we say the ball costs X, and the bat costs £1.00 more, we can say X + 1. Therefore, the bat and ball together is X + (X + 1) = 1.1. This means that if 2X + 1 = 1.1, then 2X = 0.1, and X = 0.05.

 2. If it takes 5 machines 5 minutes to make 5 widgets, then it takes 1 machine 5 minutes to make 1 widget. If there are 100 machines all working together, they can each produce 1 widget in 5 minutes still.

3. Every day forward the patch doubles in size. So, if you start at day 48 and go backwards, the patch halves in size daily. Therefore, on day 47 the lily patch is half the size of day 48 (half the size of the lake.)

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Posted on Thursday Oct 12