I have been stuck on level 72 for a while, how do I solve this level?

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    Is this level 74 or 72? You mention both... Feb 12 '16 at 16:59

The answer is 12. If you were to add all the 3 digit-number, you'll find the answer in that circle except 516. 2+6+3=11 2+6+8=16 3+5+9=17

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