The Snail on the Wall
A snail creeps 7 ft up a wall during the daytime. After all the labor it does throughout the day, it stops to rest a while... but falls asleep!! The next morning it wakes up and discovers that it has slipped down 3 ft while sleeping.
If this happens every day, how many days will the snail take to reach the top of a wall 43 ft in height?
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