Lesson 9. Solving Problems Using Ratios, Rates, Proportions, and Percents. Ratio vs Proportions. A ratio is used to compare two quantities. They are sometimes used to compare parts to parts. For example, the ratio of boys to girls is 7 to 3. (7:3 or 7/3)
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Solving Problems Using Ratios, Rates, Proportions, and Percents