Sorry this is such a short chapter. But then again, there's not a lot to say about these things, and to be honest with you, I just don't get that many questions about this stuff except when I'm doing SAT prep. Most students seem to have a pretty good time with this, and enjoy cross-multiplying, so hey.
Ratios & Proportions (SAT)
Ratios are mostly word problems that lead to cross multiplication equations, and most students find them pretty basic. In this chapter we'll work some typical problems about marbles and pizzas, and I'll emphasize the one trick they always pull on the SAT. 7.RP.1
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)