单选题
In a student body the ratio of men to women was 1 to 4. After 140 additional men were admitted, the ratio of men to women became 2 to 3. How large was the student body after the additional men were admitted?
(A) 700 (B) 560 (C) 280
(D) 252 (E) 224
(A) 700 (B) 560 (C) 280
(D) 252 (E) 224
【正确答案】
B
【答案解析】[解析] 设未加入男生之前，该学生团体的男生人数为k，则女生人数为4k，加入男生之后，男生的人数变为k+140，根据题意可得：
