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.