viewimage.php?id=20bcc42ee0df39b267bcc5&no=24b0d769e1d32ca73cef8ffa11d02831424b310c0eeaa8669b91e5ace0ad459d655a540c541e538fa983dad1531d99868386db2b2b152d121410cff28e90190e3fa3996a6b34387ed689129af474e44352b932ad1f92d7176b84d5a56abdcd2e1e856c3f5e5d

5+7+4+9+8+2+7=42

3+8+6+4+7+5+9=42

9+6+1+4+5+8+x=42


따라서 답은 9이다.