Task: Question Answering
Input (English): Problem: 5 years ago , the average age of a , b , c and d was 45 years . with e joining them now , the average of all the 5 is 50 years . the age of e is ? 
Options: a ) 50 , b ) 47 , c ) 48 , d ) 49 , e ) 46
Output (English): a