Change in Average Scores
CAT 2017 Slot 1 · Quantitative Ability · Medium · Averages
This is a medium Quantitative Ability question from the CAT 2017 Slot 1 paper. It tests Averages. The full answer key and a step-by-step explanation are below — try it yourself first, then reveal the solution.
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:
- A.
9.5
- B.
10
- C.
4.5
- D.
6
A
Explanation
Total change in class score = . Total change in girls' score = . Total change in boys' score = . Increase in average score of boys = .
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