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A snail is at the bottom of a

[单选题]
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?
  • 21 days
  • 22 days
  • 23 days
  • 24 days
  • 25 days

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