CAT 2018 Slot 2 QA Q11 Ratio, Mixtures & Averages

Question 11 of the Quantitative Ability (QA) section, CAT 2018 Slot 2, with CAT's official answer.

A 20% ethanol solution is mixed with another ethanol solution, say, S of unknown concentration in the proportion 1:3 by volume. This mixture is then mixed with an equal volume of 20% ethanol solution. If the resultant mixture is a 31.25% ethanol solution, then the unknown concentration of S is
  1. A
    50%
  2. B
    55%
  3. C
    48%
  4. D
    52%

Answer: (A) 50% Ratio, Mixtures & Averages MCQ

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