单选题
A snail is at the bottom of a 25 mete...
发布于 2022-03-03 17:21:35
A snail is at the bottom of a 25 meters deep pit. Every day the snail
climbs 5 meters upwards, but at night it slides 4 meters back downwards.
How many days does it take before the snail reaches the top of the pit?
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