Task: Question Answering
Input (English): Problem: set a of 8 positive integers may have the same element and have 40 . and set b of 8 positive integers must have different elements and have 40 . when m and n are the greatest possible differences between 40 and other elements ’ sums in set a and set b , respectively , m - n = ? 
Options: a ) 21 , b ) 29 , c ) 23 , d ) 25 , e ) 26
Output (English): a