A snail is at the bottom of a 20 feet 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 of the well?
Q1. A snail is at the bottom of a 20 feet 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 of the well?
Answer: 20 days
Explanation: The snail effectively climbs 1 foot per day. On the 18th day, it climbs 3 feet to 20 feet and doesn't slip back.