CAT 2017 Slot 1 QA Q14 Ratio, Mixtures & Averages

Question 14 of the Quantitative Ability (QA) section, CAT 2017 Slot 1, with CAT's official answer.

A class consists of 20 boys and 30 girls. In the mid-semester examination, the average score of the girls was 5 higher than that of the boys. In the final exam, however, the average score of the girls dropped by 3 while the average score of the entire class increased by 2. The increase in the average score of the boys is:
  1. A
    9.5
  2. B
    10
  3. C
    4.5
  4. D
    6

Answer: (A) 9.5 Ratio, Mixtures & Averages MCQ

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