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Math brain teasers require computations to solve.


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Difficulty:**** (3.35)
Submitted By:DakarMorad


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?

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