Home » IQ test: How much is 9 + 3? Show that you have good mathematical logic by answering this question correctly.

IQ test: How much is 9 + 3? Show that you have good mathematical logic by answering this question correctly.


Among brain challengesmathematical logic puzzles are undoubtedly the most common. They are preferred because they really test intelligence by testing a person’s logic, ingenuity and reflexes.

Want to measure your wits or simply keep your brain active during your breaks? This mental exercise is for you!

Visual test: “What’s the answer to the last equation?”

Before you start this IQ test, you need to concentrate. Indeed, even if this test It will only last a few seconds, so a good state of mind is always important to solve it. Are you ready? You can now read the following instructions.

Below, you have three equations on the left and one unsolved equation on the right. If 3 + 2 = 10, 5 + 3 = 16 and 6 + 4 = 20, then how much would 9 + 3 have to be?

© legrisou.fr

You’ve got 20 seconds to find the rule and logic used in the 3 equations on the left to solve the equation on the right. Will you be able to think beyond the basic rules of arithmetic? Prove it now!

IQ test: the right answer

It’s time to reveal the solution to this very challenging riddle. Check your insight by comparing your answer below.

The solution

The answer you had to find is 24, 9 + 3 = 24. How do you get there? The mathematical logic to follow was : A + B = C = C + C = your answer. Didn’t get it? Here are the details with the numbers:

3 + 2 = 5 and 5 + 5 = 10, so 3 + 2 = 10.

5 + 3 = 8 and 8 + 8 = 16, so 5 + 3 = 16.

6 + 4 = 10 and 10 + 10 = 20.

Finally, with the equation on the right, you have: 9 + 3 = 12 and 12 + 12 = 24. Hence the final result: 9 + 3 = 24.

© legrisou.fr

Congratulations if you’ve managed to solve this IQ test on time. You’re a real math genius! If you didn’t manage to find the right answer, don’t worry. You’ve already stimulated your brain and worked on your mathematical logic with this test.

To further develop your math skills, keep choosing these types of mental exercises to practice in your spare time.

Feel free to share this brain challenge with friends and family. Do you think they’ll manage to solve this test in time? If not, encourage them to practice their IQ skills with you!

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Toby Barber
Written by: Toby Barber
For the past decade, I've been refining my skills as a web writer, driven by my lifelong love for storytelling. I take pride in creating captivating content that transports readers to different realms and provides an escape from the ordinary. My writing ranges from articles on the latest video games to engaging entertainment pieces, always aiming to entertain and inspire. I'm excited to share my passion with you and eager to embark on this journey together to explore new horizons!