悉尼大学商学国贸双硕士毕业,现居澳洲,在澳学习生活15+年,从事教育咨询工作超过10年,澳洲政府注册教育顾问,上千成功升学转学签证案例,定期受邀亲自走访澳洲各类学校
您所在的位置: 首页> 新闻列表> SAT官方每日一题 2017年3月2日.
SAT官方每日一题 2011年3月2日
考试类型:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
In a community of people, each person owns a dog or a cat or both. If there are dog owners and cat owners, how many of the dog owners own no cat?
A.
B.
C.
D.
E.
正确答案:C 解析: To solve this problem, you must realize that some of the dog owners also own cats and some of the cat owners also own dogs. This has to be true because is more than ! The question asks how many of the dog owners do not own cats. To solve the problem, first find the number of people who own both a dog and a cat. To do this, let equal the number who own both a dog and a cat. Then . (Note: Adding and counts twice, so must be subtracted from the sum to get .) Next, the equation can be solved for , yielding . Finally, the number of dog owners who own no cat is . |
Amy GUO 经验: 16年 案例:4272 擅长:美国,澳洲,亚洲,欧洲
本网站(www.aoji.cn,刊载的所有内容,访问者可将本网站提供的内容或服务用于个人学习、研究或欣赏,以及其他非商业性或非盈利性用途,但同时应遵守著作权法及其他相关法律规定,不得侵犯本网站及相关权利人的合法权利。除此以外,将本网站任何内容或服务用于其他用途时,须征得本网站及相关权利人的书面许可,并支付报酬。
本网站内容原作者如不愿意在本网站刊登内容,请及时通知本站,予以删除。