두문장 해석하는 문제인데..가르쳐주세요...포스트 제목을 입력하세요

m: jeffer, this graph shows how many students are enrolled in introductory courses this semester.
w: does it? which course has the most students?
m: economics. it has about twice as many students as chemistry.

위문장 좀 해석해주세요...전체 다 해석해주세요...특히 does it? 이부분 해석 가르쳐주세요...전체해석도 부탁드립니다...