Common Core Math 6.rp.2
Ratios And Proportional Relationships: Understand Ratio Concepts And Use Ratio Reasoning To Solve Problems.
Understand the concept of a unit rate a/b associated with a ratio a:b with b =? 0, and use rate language in the context of a ratio relationship. For example, This recipe has a ratio of 3 cups of flour to 4 cups of sugar, so there is 3/4 cup of flour for each cup of sugar. We paid $75 for 15 hamburgers, which is a rate of $5 per hamburger.1