In volume 8 of In Another World With My Smartphone, Touya (the MC) encounters ruins containing riddles. Whilst the novel explains the questions and answers to most of them, one of them has me confused:
"Please follow the rules of the current calculation. In this system, what does X equal?" 36 = 1, 108 = 3, 2160 = 2, 10800 = X.
Touya claims the answer was straightforward and proceeds. But, whilst it may have been straightforward to him, I don't get it. If required, I can supply the answer he gives, but, I didn't want to spoil it.