Mr. Ellis is a teacher who tutors students after school. Of the students he
tutors, 30% need help in computer science and the rest need assistance in math.
Of the students who need help in computer science, 40% are enrolled in Mr.
Ellis’s class during the school day. Of the students who need help in math, 25%
are enrolled in his class during the school day. What percent of the
after-school students are enrolled in Mr. Ellis’s classes?