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  3. A total of 40 tourists went on a trip. If 18 of the tourists visited site X, 18

A total of 40 tourists went on a trip. If 18 of the tourists visited site X, 18

游客2024-01-12  20
问题 A total of 40 tourists went on a trip. If 18 of 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?
选项 A、4
B、10
C、12
D、22
E、28
答案 C
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?
解：本题的正确答案为(C)。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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