A snail is at the bottom of a 20-foot well. Each day, it climbs up 3 feet, but at night, it slips back 2 feet. How many days will it take for the snail to reach the top?
Q1. A snail is at the bottom of a 20-foot well. Each day, it climbs up 3 feet, but at night, it slips back 2 feet. How many days will it take for the snail to reach the top?
Answer: 20 days
Explanation: The snail effectively climbs 1 foot per day. On the 18th day, it reaches 18 feet and on the 19th day, it reaches 21 feet, but since it's already out, we consider 18 feet climb on 18th day.