Task: Question Answering
Input (English): Question: The average marks of a class of 25 students is 40 and that of another class of 30 students is 60. Find the average marks of all the students?

 Option A: 52.6

 Option B: 52.4

 Option C: 52.1

 Option D: 50.9

 Option E: 52.9
Output (English): Option D