A snail creeps 6 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 18 ft in height?

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The net climbed ht per day is 4ft (ie 6 -2).

1. First day climbs 4ft
2. Second day climbs 4ft (total 8ft)
3. Third day climbs 4ft (total 12ft)

4. On the forth daytime it climbs 6ft & covers 18 ft
(We are concerned about when it climbs (covers) 18ft.... Though it may fall 2ft at night!

So just 4 days