Friday Riddle Answer

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RIDDLE: If you use a certain formula on 13, you end up with 7.

Under the same formula, 2352 becomes 16, 246 becomes 14, 700 turns into 16, and 1030 becomes 14.

What would 9304 become

ANSWER:

19. Convert the number to binary, add one for every zero, and add two for every 1.

9304 becomes 10010001011000, which has 9 zeros and 5 ones