A can complete a certain job in 19 days

A can complete a certain job in 19 days. B is 90% more efficient than A. In how many days can B complete the same job?

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 #62843

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