Find the least number which when divided by 12,24,36,42 leaves remainder 9,21,33,39…

Find the least number which when divided by 12,24,36,42 leaves remainder 9,21,33,39 respectively.

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 #26889

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