Pre-Algebra Quiz
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RATIOS, RATES & PROPORTIONAL REASONING
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A recipe for salad dressing calls for oil and vinegar in a 3:1 ratio. Chen makes 2 cups of dressing following this recipe, then adds more oil to make it less acidic. After adding the oil, the ratio becomes 5:1. Chen then decides to bring the ratio back closer to the original by adding some vinegar. If he adds enough vinegar to make the final ratio 4:1, how much total vinegar will be in the final mixture?
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