[問題] GWD6-Q19

[kwtluck]

Q19:
In a survey of 200 college graduates, 30 percent said they had received student loans during their college careers, and 40 percent said they had received scholarships. What percent of those surveyed said that they had received neither student loans nor scholarships during their college careers?

(1)25 percent of those surveyed said that they had received scholarships but no loans.
(2)50 percent of those surveyed who said that they had received loans also said that they had received scholarships.

Answer:D
我認為條件二不合理 兩者都有怎麼可能有50%
請教各位大大的看法Thanks!!~~

[kwtluck]

S0S^2 => 3Q sir

[applepeko]

我覺得這題用文氏圖的方式來想會比較清楚唷!
30%拿到L,40%拿到S,加上條件二給的50%的人拿到L又拿到S。
如果代數字進去,假設有200個人
L=60個人
S=80個人
L∩S 有 100個人
則60+80等於有拿到L的人加上有拿到S的人,
但是要扣除重複的就是拿L又同時拿S的人
所以減掉100...
則得出40
那表示 沒有 L又沒有S的就是100-40=60

不曉得這樣解妮OK嗎