20 machines can do a work in 10days

20 machines can do a work in 10days. How many machines are needed to complete the work in 40days?

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 #24871

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