a snail in a well

Number Theory Level pending

there is a snail in a well. the snail climb up 5m per day, and slide down 4m while sleeping. how many days will it take a snail to go out of the well, if the well is 10m deep?


The answer is 6.

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2 solutions

Đạt Nguyễn
Mar 16, 2014

every day, the snails are crawling up 1 m, while the 5th slugs crawling up 5 m, 5 m per cow that should be day 6 days to 5 m more cows to the wellhead

Yumi Kim
Mar 16, 2014

on the 5th day, the snail climbed up 5m. and on 6th day the snail will climb up 5m and the snail should slide down while sleeping, but the snail doesnt need to slide down because the snail already climbed 10m on the 6th day before sleeping

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