The snail climbs up 7 meters each day and slips back 2 meters each night. How many days will it take the snail to get out of a well 60 meters in depth?
31
6
Explanation: Let's break down the distance the snail covers each day:
Day 1: 7-2=5
Day 2: 5+7-2=10
Day 3: 10+7-2=15
Day 4: 15+7-2=20
Day 5: 20+7-2=25
Day 6: 25+7=32
So, on Day 6 the snail will reach 32 meters and get out of the well at day, without slipping back that night.