Task: Question Answering
Input (English): Problem: find the total average marks of all the students in 2 separate classes , if the average marks of students in the first class of 39 students is 45 and that of another class of 35 students is 70 . 
Options: a ) 55.8 , b ) 51.8 , c ) 53.8 , d ) 56.8 , e ) 52.8
Output (English): d