How smart are you? World's shortest IQ test is only three questions but over 80% failed it

The world's shortest IQ test is made up of just three maths questions and shouldn't take too long to complete but it's tricky.

Called the Cognitive Reflection Test, the quiz isn't new, but was originally part of a research paper published in 2005 by MIT professor Shane Frederick. This paper has recently resurfaced online, leaving many keen to give it a go.

As part of his research, Professor Frederick had more than 3,000 participants from a range of educational backgrounds complete the test - and even those attending top American universities such as Yale and Harvard struggled to work out all the answers.

Of all those who took part only 17 percent managed to score three out of three on the test, meaning 83 percent of people failed - how will you fare?

Speaking about the test, Professor Frederick, said: "The three items on the CRT are 'easy' in the sense that their solution is easily understood when explained, yet reaching the correct answer often requires the suppression of an erroneous answer that springs 'impulsively' to mind."

1. A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?
2. If it takes five machines five minutes to make five 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 of the lake?

BEFORE YOU GO FURTHER, TRY ANSWER THE QUESTIONS AND OH BOY YOU WILL BE AMAZED AT THE LITTLE 'MISTAKE' YOU MADE. 

These are the three most common answers that people guess - but they are actually incorrect.

1. 10 cents
2. 100 minutes
3. 24 days

The correct answers are:

1. 5 cents
2. 5 minutes
3. 47 days

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