Greeks on campus. The question-and-answer column of a campus newspaper was asked what percentage of the campus was "Greek" (that is, members of fraternities or sororities). The answer given was that "the figures for the fall semester are approximately 12 percent for the girls and 15-18 percent for the guys, which produces a ‘Greek' figure of approximately 27-30 percent of the undergraduates." Discuss the campus newspaper's arithmetic.