The no.22 bus runs every five minutes. It takes Xiao Ming forty minutes from home to school. How many number 22 buses can Xiao Ming meet on the bus? (16 cars)

When a store engages in activities, every four empty bottles can be exchanged for a drink. Xiaoming now has 15 empty bottles. How many bottles of water can he drink at most? (5 bottles)

A snail climbs a 10-meter-high tree, climbs three meters during the day and sleeps two meters at night. How many days does it take to climb to the top of the tree? (8 days)