Task: Question Answering
Input (English): Problem: a set of consecutive positive integers beginning with 1 is written on the blackboard . a student came along and erased one number . the average of the remaining numbers is 35 7 / 17 . what was the number erased ? 
Options: a ) seven 7 , b ) 8 , c ) 9 , d ) 15 , e ) 17
Output (English): a