GMAT og 数学 167题怎么个思路

ellenxiangyuan · 发表于 2010-9-27 10:09:55

of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3had less than 4 years' experience and did not have a degree How many of the applicants has at least 4 years experience and a degree?

hxn871020 · 发表于 2010-9-27 10:32:23

of 30 applicants for a job, 14 had at least 4 years' experience, 18 had degrees, and 3had less than 4 years' experience and did not have a degree How many of the applicants has at least 4 years experience and a degree?

-- by 会员 ellenxiangyuan (2010/9/27 10:09:55)

Experience>4 Experience<4
Have Degree a b

Have no Degree c d

根据题意列出上表，则得出： a+b+c+d=30
a+c=14
a+b=18
d=3
把上面的c和d用a表示，代入1式，求出a=5

我的觉的画这个表的方法很好用咯~~

xw909 · 发表于 2010-9-27 11:39:43

文氏图？

ellenxiangyuan · 发表于 2010-9-27 12:49:27

非常感谢~~ 很清楚！

yuantina · 发表于 2010-9-27 12:51:56

degree no degree sum
>4 exp (14-9=5) (12-3=9) 14
<4 exp (16-3=13) 3 (30-14=16)
sum 18 (30-18=12) 30

ellenxiangyuan · 发表于 2010-9-27 14:12:32

非常感谢~~~

GMAT og 数学 167题怎么个思路

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