Famous Priest Well- Riddle

Riddle 
An old priest fell then the bottom of the well of a church.
The well is 20 inches deep.
In the day time, the old priest climbs 5 inches but when in at dark he slips 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 inches more, he will be out of the well :-)

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Famous Priest Well- Riddle