SAT Math Practice: Ratios, Probability and Statistics

SAT Math Practice: Ratios, Probability and Statistics

Choose one best answer. Each attempt draws 10 of 20 questions; the practice pass mark is 8/10. Ratios, weighted means, probability and interpretation of data. Original topic practice, not an official exam or score prediction.
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A mixture contains 20 mL of dye and 80 mL of water. Assuming volumes add, what fraction of the mixture is dye?