*Did you know : IQ tests have been around for over a century and have undergone various changes over time. They were created in France to identify students who needed extra help in school. Later, the U.S. government used modified versions of intelligence tests during World War I. The military used these tests to identify qualified candidates so they wouldn’t send unprepared men into combat. This custom is still in use today.
What number do you see in this optical illusion?

This optical illusion is considered one of the easiest. You still have to concentrate on the whole image and free your mind. The challenge is simple: you have to find a 3-digit number that is hidden in the illustration. Normally, after a few seconds, you will quickly find the answer!
Image solution

Did that reddish mass confuse your eyes so much that you couldn’t make out the number in question? Look at the image again: if you look closely, in the foreground you will notice the presence of three large shapes. Of course, it is barely perceptible, but you can make out the number 571.

If you failed this visual challenge, don’t worry. There are many such tests on the internet that will help you train to improve your cognitive abilities. Intelligence tests are divided into two categories, those for children and those for adults. To get the desired results, start with simplicity and work your way up to complexity.