Brain Test Level 520 Can you solve this. genius?

Daze Puzzle provides a complete walkthrough for "Brain Test Level 520: Can you solve this, genius?".

By Emre Parlak /
Question
Can you solve this, genius?
Hints
Hint 1:
Sum up the digits.
Step 1
Answer
Each answer equals the sum of the digits of the number on the left. The sum of the digits of 123 is 6.