单选题
A total of 40 tourists went on a trip.If 18of the tourists visited site X,18 visited site Y.and 8 visited both site X and site Y,how many visited neither site X nor site Y?
A. 4 B. 10 C. 12
D. 22 E. 28
A
B
C
D
E
【正确答案】
C
【答案解析】
总计40个游客去旅行,若18人参观了景点X,18个人参观了景点Y,8个人既参观了景点X又参观了景点Y,问有多少人既未参观景点X,又未参观景点Y?
显然可用图形来直观表示:
[*]
因此既未参观景点X,又未参观景点Y的人数为:
40-(18+18-8)=12人
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