> For the complete documentation index, see [llms.txt](https://computational-thinking-in-room11.gitbook.io/room-112-dhs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://computational-thinking-in-room11.gitbook.io/room-112-dhs/problemsolving/problem-9.md).

# Problem 9

Guess & Check

The mayor of SmallTown was worried that he might need to build a new school. He  counted the number of children under the age of 13 and found that there are 9 boys to every 10 girls living in SmallTown USA.. There are a total of 2,622 children living inside the city limits. How many girls are there?

![](https://2507214486-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LpUPSf3tCxHePJxNjfg%2F-M032mn2HSuz2FDOlFMl%2F-M037bfYWZes3y93HfR1%2Fgiphy.gif?alt=media\&token=1aceb04e-3306-4947-a302-e47eaf0e07b0)