Welcome to Javaranch.
I must admit that I found that question a little frustrating too. From what I understand, you're very unlikely to encounter a question like that on the real exam. But in the unfortunate event that you do, I suggest that you just leave it till after you've confirmed your answers to all the other questions. If all goes well, you should
have at least 20 min remaining then, which will hopefully be enough to solve the puzzle. If not, well, 71/72 is a great score too.
The Whizlabs mock exams contain a similar puzzle-like question, which I just skipped entirely during my preparation. Honestly, I wouldn't waste too much time on questions like these. At the end of the day, the SCJP
is all about developing and demonstrating your Java
proficiency, so don't let the occasional oddball question discourage you.