首页
登录
职称英语
There are 20 classes in School Y. The number of students in each class is either
There are 20 classes in School Y. The number of students in each class is either
游客
2025-02-23
32
管理
问题
There are 20 classes in School Y. The number of students in each class is either 27 or 28. Now the school plans to set one extra class such that the average number of students in each class is 0.5 less than before. What is the number of students in the extra class? ________.
选项
答案
17
解析
设20个班平均学生数为X有27<X<28,原来的总人数为20X。而新加的班的学生数是21(X-0.5)-20X,化简后为X=10.5。因为27<X<28,所以16.5<X-10.5<17.5。又因为人数必须是整数,所以答案是17。
转载请注明原文地址:http://tihaiku.com/zcyy/3969806.html
相关试题推荐
Thisoldladyhastwodaughters,______ofwhomislivingnearby.A、noneB、neither
Eitherheescaped,orhewasputinprison,in______hewasneverseenagain.A、al
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
Manystudentsfindtheexperienceofattendinguniversitylecturestobeac
随机试题
•Readthearticlebelowaboutmonopoly.•Choosethecorrectwordtofill
[originaltext]Lightningisaflowofelectricityformedhighabovetheeart
Happinessisachoice:youcanchoosetobesadwheneverythingisgoingwel
A、Ithelpsprotecttheboneandprotectsusfromdiseases.B、Itmayprotectthe
带宽(频宽)的含义是指A.探头扫描的声束宽度 B.线阵探头发出超声束的宽度
通过骨髓细胞学检查就可以诊断的造血系统疾病是A、白血病B、缺铁性贫血C、溶血
2015年,全国居民人均可支配收入为21966元,比上年增长8.9%,增长率比2
下列有关保险合同的解除的说法错误的是:()A.张三经妻子安娜同意,以妻子安
《处方管理办法》规定,儿科处方印制用纸应为A.白色 B.淡红色 C.淡黄色
针对备选方案的结构类型选用适宜的比选方法。对于不同结构类型的方案,要选用不同的比
最新回复
(
0
)