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In the playlist below are a few short combined-work videos I made for my students. In the first four videos, I introduce three reliable tools with which to attack combined work questions. In the remaining videos I use those tools to solve all the combined work questions in the Official Guide.
If you're struggling with combined work, or if you're completely new to the q-type, I recommend that you: 1. Watch the first four videos 2. Try the Combined Work questions from the official guide on your own (in OG 2017: 65, 85, 96, 114, 179, 238, 328) 3. Watch the videos for the OG questions you struggled with.
The videos are not meant to be viewed passively. Pause them to try questions or parts of questions on your own. Skip ahead when the video is covering a concept or part of a question you've already mastered (I try to change colors at important parts of the question to make skipping ahead easier).
Feedback on the videos would be much appreciated.
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