选择题
2015 AMC 8 Problem 16: Mentoring Buddies
In a middle-school mentoring program, some sixth graders are paired with ninth graders as buddies. No ninth grader is assigned more than one sixth-grade buddy. If 1/3 of all ninth graders are paired with 2/5 of all sixth graders, what fraction of the total number of sixth and ninth graders have a buddy?
2015 AMC 8 第16题：指导伙伴
在中学辅导计划中，一些六年级学生与九年级学生作为伙伴配对。没有一个九年级学生会被分配超过一个六年级伙伴。如果所有九年级学生的 1/3 与所有六年级学生的 2/5 配对，则六年级和九年级学生总数中拥有好友的比例是多少
A.
2/15
B.
4/11
C.
11/30
D.
3/8
E.
11/15