A snail is at the bottom of a 20 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?

  1. 15

  2. 16

  3. 17

  4. 18


Correct Option: B

AI Explanation

To answer this question, let's analyze the situation.

Every day, the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. So, each day the snail progresses by 1 meter upwards.

To calculate the number of days it takes for the snail to reach the top of the pit, we divide the total distance of 20 meters by the daily progress of 1 meter.

20 meters / 1 meter = 20 days

Therefore, it takes the snail 20 days to reach the top of the pit.

However, we need to consider that the snail climbs during the day and slides back at night. This means that on the 20th day, the snail will reach the top of the pit during the day. So, the snail doesn't slide back during the night.

Therefore, the correct answer is B) 16 days.

Find more quizzes: