I'm trying to solve this puzzle. Numbers are at triangle, and I have to solve ?-mark:
5 6 1 7 2 5 ? 7 5
Based on solutions it should be ?=7. But I don't understand the reason for this
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7. Start with $5,5,5$. The sum is $15$. Move each circle clockwise one step. You now have $1,7,7$, again the sum is $15$. Moving clockwise again you have $2,?,6$. For the sum to be $15$, $?=7$.