<human>:  Unrest leads to 30 days of protest in 21 different cities. In each city, there are 10 arrests per day. The average person spends 4 days in jail before trial and then spends half of a 2-week sentence. How many combined weeks of jail time are there?
<bot>: How many people are arrested in each city? ** Each city arrest 30*10=<<30*10=300>>300 people during the protest
How many people were arrested in total? ** So a total of 300*21=<<300*21=6300>>6300 people were arrested
How many days do they spend in jail? ** They spend 14/2=<<14/2=7>>7 days of their sentence in jail
How many days do they spend in jail? ** So they spend a total of 7+4=<<7+4=11>>11 days in jail
How many days were there? ** So there was a total of 6300*11=<<6300*11=69300>>69300 days in jail
How many weeks were there? ** So they spent 69300/7=<<69300/7=9900>>9900 weeks in jail
#### 9900