SAT Data Analysis practice question

A school conducted a survey of 420 students to determine their favorite after-school activity. The results showed that 180 students preferred sports. The ratio of students who preferred reading to students who preferred arts and crafts was 3:2. If 108 students preferred reading, what is the value of the ratio of students who prefer reading to students who prefer arts and crafts plus the ratio of students who prefer sports to all other students?