RapidFellow

I am participating in an Advent calendar, that consists of 24 math problems (one per day until christmas).

The tasks are always quite interesting, so if you also want to try it out, you can still participate (it exists in German, English and Dutch).

Just wanted to show you the problem for today... maybe you find the correct of the 10 ansers  

https://www.mathekalender.de/index.php?page=problem&problemID=14&lang=en

Please be reminded that publishing the solution or something similar is prohibited.