Task: Question Answering
Input (English): Problem: students of 3 different classes appeared in common examination . pass average of 10 students of first class was 45 % , pass average of 15 students of second class was 60 % and pass average of 25 students of third class was 80 % then what will be the pass average of all students of 3 classes ? 
Options: a ) 74 % , b ) 75 % , c ) 67 % , d ) 72 % , e ) none
Output (English): c