Task: Question Answering
Input (English): Problem: in a graduating class , 40 percent of the students are male . in this class , 40 percent of the male students and 20 percent of the female students are 25 years old or older . if one student in the class is randomly selected , approximately what is the probability that he or she will be less than 25 years old ? 
Options: a ) 0.9 , b ) 0.72 , c ) 0.45 , d ) 0.35 , e ) 0.28
Output (English): b