Task: Question Answering
Input (English): Problem: of the 720 students at a certain university , 25 percent are seniors . if x seniors were to graduate early and leave the university and no additional students entered or left the university , what value of x would reduce the number of seniors at the university to 20 percent ? 
Options: a ) 30 , b ) 36 , c ) 42 , d ) 45 , e ) 48
Output (English): d