A snail fell into a well that is 300 cm deep.
In the first hour, it climbed 80 cm up the well.
In the second hour, it climbed 70 cm up the well.
Each hour, it managed to climb 10 cm less than the hour before.
How many hours did it take to climb out of the well?
Solution
1st h --> 80 cm
2nd h --> 70 cm
3rd h --> 60 cm
4th h --> 50 cm
5th h --> 40 cm
(80 + 70 + 60 + 50 + 40) cm = 300 cm
--> 5 hours
Answer: 5 h
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