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: 18
Explanation: The snail climbs 1 foot per day. On the 18th day, it will be at 18 feet. On the 19th day, it will climb to 21 feet and escape.