Khan Academy Practice:
Solve the proportion:
https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-write-and-solve-proportions/e/proportions_1
Rates, Ratios, and Proportions:
https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates
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