Question

14. In a Mathematics test, the average score obtained by Class 2A is 72 and
the average score obtained by Class 2B is 75. The average score obtained by
the two classes is 73.48. Given that there is a total of 75 students in the
two classes, find the number of students in each class.​

Answer 1

37 students

I just used claculator ;p

Answer 2

Statement 1 gives you the average arithmetic mean for class B but then it doesn't mention how many students were there in the classes. So insufficient.

Statement 2 gives you the comparison between the number of students in the two classes but no information about the mean in class B. So insufficient again.

Putting together, we still don't know the absolute numbers of the number of students in the classes. Hence the answer is E.

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