问题
单项选择题
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
答案
参考答案：B
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：
所以加入男生后该学生团体的人数为(k+140)+4k=5k+140=560人。