首页
登录
职称英语
If the average (arithmetic mean) of x and y is 40, and z-x=60, what is the avera
If the average (arithmetic mean) of x and y is 40, and z-x=60, what is the avera
游客
2024-01-14
47
管理
问题
If the average (arithmetic mean) of x and y is 40, and z-x=60, what is the average of y and z?
选项
A、20
B、50
C、65
D、70
E、140
答案
D
解析
To get the average of y and z, you need to find half of the sum of y+ z. To obtain that number, first restate the first statement as an equation: x+y=80. Add that equation to z-x=60, so that x+y+z-x=80+60=y+z=140. The average of y and z is 140/2=70.
转载请注明原文地址:https://tihaiku.com/zcyy/3360463.html
相关试题推荐
Iftheaverage(arithmeticmean)ofaandbis110,andtheaverageofbandci
Acaraverages40milesperhourforthefirst6hoursofatripandaverages60
Ofthenumbersq,r,s,andt,whichisgreatest?(1)Theaverage(arithmeticme
Khalildrove120kilometersinacertainamountoftime.Whatwashisaveragesp
IntheUnitedStates,averagefuelefficiencyofnewlymanufactureddomesticcar
TheaveragelifeexpectancyfortheUnitedStatespopulationasawholeis9yea
InArgoniatheaverageratedriverspayforcaraccidentinsuranceisregulated
Aresearcherstudyingdrugaddictsfoundthat,onaverage,theytendtomanipula
IntheUnitedStatesin1986,theaveragerateofviolentcrimeinstateswiths
Theaverageageofchiefexecutiveofficers(CEOs)inalargesampleofcompanies
随机试题
●Readthefollowingpassage.●Arethesentences16-22"Right"or"Wrong"?Ift
HowtoConductResearchOnline1.Definingyoutopic【T1】
[originaltext]ResearchersatStanfordUniversityhavedevelopedanewmater
A.abundantB.casuallyC.concernsD.epidemicE.exaggeration
英国的小学教师们正在尝试在课堂上使用随身摄像头,记录表现差的孩子们的行为。【T1】英格兰至少有两家学校已经引进了这种设备进行持续录像,这已经得到了当地教育
交通事故、火灾事故自发生之日起()日内,事故造成的伤亡人数发生变化的,应当及时
A.正常潮气量通气,正常血压 B.低潮气量通气,正常或稍高血压 C.过度通气
关于输血的知识,下列说法中正确的一项是()。A.输血前经过检疫就能够避免受血
某通风工程,需要输送气体压力为10kPa的小流量气体,应选用的通风机型式为(
最新回复
(
0
)