XKCD game theory question

from blog The Universe of Disco, | ↗ original
(Source: XKCD “Exam numbers”.) This post is about the bottom center panel, “Game Theory final exam”. I don't know much about game theory and I haven't seen any other discussion of this question. But I have a strategy I think is plausible and I'm somewhat pleased with. (I assume that answers to the exam question must be real numbers — not — and...