ರೇಖಾಚಿತ್ರದಲ್ಲಿ ಕಾಣೆಯಾದ ಸಂಖ್ಯೆಗಳನ್ನು ಭರ್ತಿ ಮಾಡಿ.

The official answer is 15. Pairing each number with the one opposite it gives 5 → 9 and 6 → 11, and the missing number opposite 7 is 15; no single simple rule fits every pair, so treat this one as the official answer.