in a graduating class , 40 percent of the students are male . in this class , 40 percent of the male students and 30 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 ?
"let x be the total number of students . the number students who are younger than 25 is 0.6 * 0.4 x + 0.7 * 0.6 x = 0.66 x the answer is a ."
subtract(const_1, add(multiply(divide(40, const_100), divide(40, const_100)), multiply(divide(30, const_100), subtract(const_1, divide(40, const_100)))))