Find the greatest number which leaves the same remainder when it divides…

Find the greatest number which leaves the same remainder when it divides 20, 40 and 90.

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 #42256

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