A and B together can do a piece of work in 6…

A and B together can do a piece of work in 6 days and A alone can do it in 13 days. In how many days can B alone can do it?

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 #1045