7. Fifty percent of the articles in a certain magazine are written by staff members. Sixty percent of the articles are on current affairs. If 75 percent of the articles on current affairs are written by staff members with more than 5 years experience of journalism, how many of the articles on current affairs are written by staff members with more than 5 years experience? 1. 20 articles are written by staff members. 2. Of the articles on topics other than current affairs, 50 percent are by staff members with less than 5 years experience.