If x and y are positive integers, which of the following CANNOT…

If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 45x and 20y?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #37381

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