Task: Question Answering
Input (English): Problem: a movie buff owns movies on dvd and on blu - ray in a ratio of 7 : 2 . if she buys 5 more blu - ray movies , that ratio would change to 13 : 4 . if she owns movies on no other medium , what was the original number of movies in her library before the extra purchase ? 
Options: a ) 22 , b ) 28 , c ) 77 , d ) 99 , e ) 351
Output (English): e