the snail gaios 1 ft each day.
After 17 days, he has made it 17 ft.
On the 18th day he climbs the last 3 feet and is out.
A snail fell on a dry well 20ft. high. This snail has the behavior of climbing up 3 ft high half of the day and going down 2 ft. half of the day . How many days this snail reach the top of the well?
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