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[Problem Solving]

试题详情

题目:

Of the 150 houses in a certain development, 60 percent have air- conditioning, 50 percent have a sunporch, and 30 percent have a swimming pool. If 5 of the houses have all three of these amenities and 5 have none of them, how many of the houses have exactly two of these amenities?

选项:

A、10
B、45
C、50
D、55
E、65

答案:

D

提问:

不知道该用哪个公式 做不出来D

解答:

点赞0
阅读1773
解答: 徐小梅

提问:

不知道该用哪个公式 做不出来D

解答:

点赞0
阅读1788
解答: 徐小梅老师

提问:

不知道该用哪个公式 做不出来D

解答:

点赞0
阅读1774
解答: 徐小梅老师

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