Task: Question Answering
Input (English): Problem: david obtained 70 , 60 , 78 , 60 and 65 marks ( out of 100 ) in english , mathematics , physics , chemistry and biology what are his average marks ? 
Options: a ) 75 , b ) 27.6 , c ) 66.6 , d ) 16.5 , e ) 11
Output (English): c