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------------------------------------------------ 1. Which ratios form a proportion? Use equivalent ratios to test each pair.
a. \(\frac{4}{9}, \frac{2}{3}\)
b. \(\frac{6}{15}, \frac{9}{12}\)
c. \(\frac{12}{16}, \frac{15}{20}\)
d. \(\frac{18}{20}, \frac{24}{30}\)
2. Which ratio forms a proportion with \(\frac{20}{30}\)?
a. \(\frac{16}{24}\)
b. \(\frac{10}{20}\)
c. \(\frac{17}{51}\)
d. \(\frac{15}{60}\)
3. Which ratios form a proportion?
a. \(\frac{9}{17}, \frac{27}{50}\)
b. \(\frac{12}{35}, \frac{24}{75}\)
c. \(\frac{15}{55}, \frac{33}{121}\)
d. \(\frac{12}{35}, \frac{20}{70}\)