An old priest fell on a bottom of the well of a…

An old priest fell on a bottom of the well of a church. The well is 16 inches deep. At day time, the old priest climbs 5-inches but when at dark he slip back 4 inches. In how many days priest will come out of the well ?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #3580