※ 引述《a1985526 (new)》之铭言： : Q: Of the 500 business people surveyed, 78 percent said that they use their : laptop computer in hotels, and 52 percent said that they use them both at home : and in hotels. How many of the business people surveyed said that they do not : use their laptop computers either at home or in the hotels? : A. 45 B. 55 C. 65 D.95 E. 130 : Ans: A : 要怎麽求出the percentage of people use laptop at home? : 或者不需要知道也算得出答案吗? : 谢谢! Of the 500 business people surveyed, 78 percent said that they use their laptop computers at home, 65 percent said that they use them in hotels,and 52 percent said that they use them both at home and in hotels. How many of the business people surveyed said that they do not use their laptop computers either at home or in hotels? .78*500=390at home .65*500=325in hotels .52*500=260 both 500-390-325+260=45 你少了一大句了 --

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