5
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enter image description here

I truly have no idea what should I do. The only relation I could find is, on circle $2$, $38$ is equal to $19\times2$ (from circle one), and on circle $3$, $72$ is equal to $18\times4$ (from circle one). It was a multiple choice about a question in series of arithmetics, and the choices were $11, 12, 13, 14,$ and $15$. I just couldn't prove any of the choices.

I didn't know where the source was from, a friend sent it to mine.

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  • 1
    $\begingroup$ Welcome to puzzling! If you had gotten this puzzle from somewhere else, please state where you've gotten it from! $\endgroup$ – UnidentifiedX Apr 10 at 2:46
  • $\begingroup$ @Marchotridyo Please accept the answer if it is right. $\endgroup$ – Aashu Apr 11 at 12:18
10
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Solution:

15

Explanation:

I noticed that the sum of numbers in the lower parts results in a number that is one more than or equal to a perfect square.
I think the number at the top is the root of that square increased by one.

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