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Snail Up The Wall

A snail creeps 10 feet up a wall during the daytime, then falls asleep. It wakes up the next morning and discovers it slipped down 6 feet. If this happens each day, how many days will it take to reach the top of a 20 foot wall?

Four days.

Day 1: up to 10, down to 4
Day 2: up to 14, down to 8
Day 3: up to 18, down to 12
Day 4: up to 22 (20 really) and done

Posted in Brain Teasers

 

5 Comments on "Snail Up The Wall"


Pavan suresh says
June 27, 2015 @ 01:09

Its 5 days and not 4 days!!


Dan says
June 30, 2015 @ 21:27

Nope, it’s 4. Draw a diagram for each day and you’ll see why.


Jordan says
July 5, 2015 @ 18:49

Awesome


Lisa says
March 29, 2016 @ 07:28

It’s 4 days. It seems like it should be 5 days, but at the end of day 4, snail will be at the top of the wall, so he won’t slip back 6 feet like every other day.


Ed says
April 13, 2017 @ 01:11

what feirce determination


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