This is a MAML (Maine Association of Math Leagues) problem from February 2011 (Meet 4 of 2010-11), Round 4, Problem 3: http://maml.net/problems.htm
The operating system used was Ubuntu 16.04 LTS: http://www.ubuntu.com/
Also, this was recorded with Vokoscreen: http://packages.ubuntu.com/trusty/vid...
The slideshow was made on Google Slides, the math equations were made on Google Docs with gMath: https://chrome.google.com/webstore/de...
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Slideshow:
https://drive.google.com/open?id=1qfo...