A can do a piece of work in 15 days

A can do a piece of work in 15 days. A does the work for 5 days only and leaves the job. B does the remaining work in 12 days.In how many days B alone can do the work?

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 #17887