One of the most common ways to put yourself to the test to see how smart you are compared to your peers is by taking an IQ test.
These tests are often very long and contain a number of questions that are designed to require you to use different parts of the brain to answer.
However, if you don't feel like taking a lengthy test, you may be in luck, as we've found a solution for you.
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The world's shortest IQ test is thought to have just three questions - but don't be fooled as they can be extremely tricky.
While the test might appear to be pretty straightforward, it proves challenging for many, and only around 17 per cent of people were able to pass it during a study.
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 and has gone viral and 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.
He found that even students attending some of America's top universities, such as Yale and Harvard, struggled to work out all the answers.
Of all those who took part, only 17 per cent managed to score three out of three on the test, meaning 83 per cent 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."
Here's a look at the questions:
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?
These are the three most common answers that people guess - but they are actually incorrect.
1. 10 cents
2. 100 minutes
3. 24 days
Professor Frederick adds: "Anyone who reflects upon it for even a moment would recognise that the difference between $1 and 10 cents is only 90 cents, not $1 as the problem stipulates.
"In this case, catching that error is tantamount to solving the problem, since nearly everyone who does not respond '10 cents' does, in fact, give the correct response."
The correct answers are:
1. 5 cents
2. 5 minutes
3. 47 days
Still puzzled by all of this? Thankfully, Presh Talwalkar, the author of The Hoy of Game Theory: An Introduction to Strategic Thinking, explained how to work out the correct answers on his blog, Mind Your Decisions.
1. Say the ball costs X. Then the bat costs $1 more, so it is X + 1. So we have bat + ball = X + (X + 1) = 1.1 because together they cost $1.10. This means 2X + 1 = 1.1, then 2X = 0.1, so X = 0.05. This means the ball costs 5 cents, and the bat costs $1.05
2. If it takes 5 machines 5 minutes to make 5 widgets, then it takes 1 machine 5 minutes to make 1 widget (each machine is making a widget in 5 minutes). If we have 100 machines working together, then each can make a widget in 5 minutes. So there will be 100 widgets in 5 minutes.
3. Every day FORWARD the patch doubles in size. So every day BACKWARDS means the patch halves in size. So on day 47 the lake is half full.
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