PP DS 10

fly12404 · 发表于 2010-7-17 15:29:19

10. 719-!-item-!-187;#058&000515
Of the 800 studentsat a certain college, 250 students live on campus and are more than 20 yearsold. How many of the

800 students liveon campus and are 20 years old or less?

(1) 640 students at the college are more than 20years old.

(2) 60 students at the college are 20 years oldor less and live off campus.

答案是C
不懂...
我以為是B 還是我題意誤解
煩請高手相助

fly12404 · 发表于 2010-7-17 16:22:40

題目沒看清楚
抱歉問了蠢問題

PP DS 10

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