The well of a church-Riddle

Riddle 
An old priest fell on the bottom of the well of a church.
The well is 20 inches deep. At daytime, the old priest climbs 5-inches but when at dark he slipped back 4 inches.
In how many days priest will come out of the well?

    16-days In 15-days, he will climb 15-inch and when he climbs 5 inch more, he will be out of the well

Mindyourlogic Riddle: Answer:
The well of a church-Riddle