Task: Question Answering
Input (English): Problem: a man whose bowling average is 12.4 , takes 5 wickets for 26 runs and there by decreases his average by 0.4 . the number of wickets taken by him before his last match is ? 
Options: a ) 82 , b ) 83 , c ) 84 , d ) 85 , e ) 86
Output (English): d