Task: Question Answering
Input (English): Problem: the average weight of a class is x pounds . when a new student weighing 50 pounds joins the class , the average decreases by 1 pound . in a few months the student ’ s weight increases to 110 pounds and the average weight of the class becomes x + 4 pounds . none of the other students ’ weights changed . what is the value of x ? 
Options: a ) 85 , b ) 86 , c ) 88 , d ) 90 , e ) 92
Output (English): a