Here's why:
* Hex is a shortened form of "hexadecimal".
* Hexadecimal is a number system with base 16, using digits 0-9 and letters A-F.
* In hexadecimal, the letter A represents the decimal number 10, B represents 11, and so on.
* F represents the decimal number 15.
* Therefore, hex is associated with the number 16, which is 6 more than 10.
Let me know if you have any more word puzzles!