Bonus problems (2009–2010)

Here are the bonus problems, with solutions, that I have given so far this year in math league. You can submit answers up to the time when I post the solution on this page. You can discuss the problem with whoever you want, but answers must be submitted in your own handwriting. It is not enough to submit a number as your answer. Some explanation of how you solved it must be provided as well.

Solutions will appear here the day after they are due.