A snail is at the bottom of a 20 meters deep pit. Everyday the snail climbs 5 meters upwards, but at night it slides to 4 meters back downwards. How many days does it take before the snail reaches the top of the pit?
Answer: 16 days. Since the snail moves up 1 meter a day so it will reach 15 meters in 15 days. Next day it will again climb 5 meters upward and reaches the top.
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