The geniuses will solve it in 20 seconds: Are you among them?

Enigmas are excellent for training, especially in the morning, and mathematics is a special challenge. We bring you one that only a few can solve in 20 seconds. Are you among the geniuses? Here is the task: What is your solution? If you are not sure of your answer or want to check, here [...]
Enigmas are excellent for training, especially in the morning, and mathematics is a special challenge.
We bring you one that only a few can solve in 20 seconds.
Are you among the geniuses?
Here is the task:

What is your solution?
If you are not sure of your answer or you want to check, there are solutions:











