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