7.RP.A.1
Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units. For example, if a person walks 1/2 mile in each 1/4 hour, compute the unit rate as the complex fraction 1/2/1/4 miles per hour, equivalently 2 miles per hour.
Compute real-world unit rates associated with ratios of fractions. For example: Joe uses 3/5 cup of strawberries per every 1/3 cup of blueberries to make a smoothie. How many cups of strawberries per cup of blueberries? Here's a similar problem and its solution. You can practice these types of problems here.