JJ 21

清飞扬 · 发表于 2012-4-10 19:45:13

二十一（待完整）
班上有18个boys，全班学A科目的一共26人，学A的boys的人数已知，问班上一个多少人？
1）女生不学生物的人数
2）女生不学生物的人数是男生不学生物的人数的2倍
（提供者ID：levanself 原文：~~~ DS题
[td=76] 学什么
[/td] [td=85] 不学生物
[/td]

[td=47]
[/td] [tr] [td=54] Boys
[/td] [/tr] [td=76] 给数字了
[/td] [td=85]
[/td] [td=47] 18
[/td] [tr] [td=54] Girls
[/td] [/tr] [td=76]
[/td] [td=85]
[/td] [td=47]
[/td] [tr] [td=54] total
[/td] [/tr] [td=76] 26
[/td] [td=85]
[/td] [td=47]
[/td]
问全班人数是多少？
条件一：女生不学生物的人数
条件二：女生不学生物的人数是男生不学生物的人数的2倍
第21题是考古GWD第22套的

Q32:

NumberStudying Number Not Total
Biology Studying Biology
Number 18
of Boys
Number
of Girls
Total 26

The table above shows the number of students in acertain high school class who are boys and the number of students in the classwho are studying biology. What is thetotal number of students in the class?
(1) Ofthe boys in the class, 15 are studying biology.
(2) Thenumber of girls in the class is twice the number of students in the class whoare not studying biology.

A. Statement (1) ALONE is sufficient, butstatement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, butstatement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, butNEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOTsufficient.
答案选D~~~

=========================

觉得这道应该选B吧
因为条件1，我觉得求不出女生没有修biology的人数，只有条件2是满足的
在这个帖子上，也有人说，答案是B的
http://forum..org/viewthread.php?action=printable&tid=56554
大家来讨论下吧

JJ 21

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