Table of Contents

#### KEY HIGHLIGHTS

- The world’s shortest IQ test was part of a research paper published in 2005 by MIT professor Shane Frederick
- It has just three questions
- Only 17 per cent manage to answer all questions correctly

Want to test your intelligence but don’t want to sit through a lengthy

We have the perfect solution for you!

Here’s the world’s shortest IQ test. It consists of just 3 questions and won’t take too long to finish. But be informed that it’s pretty tough.

The IQ test called the Cognitive Reflection Test was part of a research paper published in 2005 by MIT professor Shane Frederick.

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More than 3,000 participants from a range of educational backgrounds completed the test.

But **only 17 per cent managed to score three out of three.**

This means that **83 per cent of people FAILED the world’s shortest IQ test**.

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**World’s shortest IQ test**

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?

**World’s shortest IQ test answers that people guess but are incorrect**

1. 10 cents

2. 100 minutes

3. 24 days

If you want to try again, scroll up.

Scroll down when you’re ready to check the correct answers to the world’s shortest IQ test answers.

**World’s shortest IQ test answers**

1. 5 cents

2. 5 minutes

3. 47 days

**World’s shortest IQ test answers explanation**

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.