Task: Question Answering
Input (English): Problem: the average runs scored by a batsman in 15 matches is 30 . in the next 20 matches the batsman scored an average of 15 runs . find his average in all the 30 matches ? 
Options: a ) 31.56 , b ) 25.65 , c ) 21.43 , d ) 28.36 , e ) 27.96
Output (English): c