Task: Question Answering
Input (English): Problem: on sunday , bill ran 4 more miles than he ran on saturday . julia did not run on saturday , but she ran twice the number of miles on sunday that bill ran on sunday . if bill and julia ran a total of 28 miles on saturday and sunday , how many miles did bill run on sunday ? 
Options: a ) 5 , b ) 6 , c ) 7 , d ) 8 , e ) 9
Output (English): d