A can do a job in 9 days and B can do…

A can do a job in 9 days and B can do it in 27 days. A and B working together will finish twice the amount of work in ------- days?

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

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #3374