Analyze proportional relationships and use them to solve real-world and mathematical problems.
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. (7.RP.1)
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