Task: Question Answering
Input (English): Problem: a students was asked to find the arithmetic mean of the numbers 3 , 11 , 7 , 9 , 15 , 13 , 8 , 19 , 17 , 21 , 14 and x . he found the mean to be 12 . what should be the number in place of x ? 
Options: a ) 3 , b ) 7 , c ) 17 , d ) 31 , e ) 38
Output (English): b