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?
Each city arrest 30*10=
<gadget id="calculator">30*10</gadget>
<output>300</output>
300 people during the protest.
So a total of 300*21=
<gadget id="calculator">300*21</gadget>
<output>6_300</output>
6300 people were arrested.
They spend 14/2=
<gadget id="calculator">14/2</gadget>
<output>7</output>
7 days of their sentence in jail.
So they spend a total of 7+4=
<gadget id="calculator">7+4</gadget>
<output>11</output>
11 days in jail.
So there was a total of 6300*11=
<gadget id="calculator">6300*11</gadget>
<output>69_300</output>
69300 days in jail.
So they spent 69300/7=
<gadget id="calculator">69300/7</gadget>
<output>9_900</output>
9900 weeks in jail.

<result>9_900</result>