6.RP.A.3
Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations.
Solve equivalent ratio problems, both word problems and mathematical problems. Some of these problems can be multiple-choice. For example, which ratio is equivalent to 6 : 10? Next, give your students this challenge, then this one. Finally, give your students this challenge: In the figure below, what is the ratio of teal to orange?
The solution can be found here.