作业帮求助一道GRE数学题!
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求助一道GRE数学题!
In a group of 100 students, more students are on the Fencing team than are members of the French club. If 70 are in the club and 20 are neither on the team nor in the club, what, is the minimum number of students who could, be both on the team and in the club?
A 10 B 49 C 50 D 60 E 61
求解析!
In a group of 100 students, more students are on the Fencing team than are members of the French club. If 70 are in the club and 20 are neither on the team nor in the club, what, is the minimum number of students who could, be both on the team and in the club?
A 10 B 49 C 50 D 60 E 61
求解析!
100个学生,在team的比在club的多,现在知道70个在club,20个既不在team也不在club,问最少多少人既在 team也在club.
1、因为有20个什么都没参加,所以参加了至少一个队伍的有80个.
2、因为在team的比在club的多,所以在team的至少有71个.也就是说,80人里最多9人是只参加了club的.
3、同理可得,80人里最多10人是只参加了team的.
4、所以结果80-9-10=61.
1、因为有20个什么都没参加,所以参加了至少一个队伍的有80个.
2、因为在team的比在club的多,所以在team的至少有71个.也就是说,80人里最多9人是只参加了club的.
3、同理可得,80人里最多10人是只参加了team的.
4、所以结果80-9-10=61.