首页
登录
职称英语
15 is 60% of what number?25Use the decimal equivalent of 60%. Because 60% of som
15 is 60% of what number?25Use the decimal equivalent of 60%. Because 60% of som
游客
2024-01-12
64
管理
问题
15 is 60% of what number?
选项
答案
25
解析
Use the decimal equivalent of 60%. Because 60% of some number z is 15, multiply z by the decimal equivalent of 60%, or 0.6.
0.6z=15
Now solve for z by dividing both sides of the equation by 0.6 as follows.
z =
= 25
Using a proportion, look for a number z such that
Hence, 60z =(15)(100), and therefore, z =
= 25. That is, 15 is 60% of25.
Although the discussion about percent so far assumes a context of a part and a whole, it is not necessary that the part be less than the whole. In general, the whole is called the base of the percent. When the numerator of a percent is greater than the base, the percent is greater than 100%. For example, 15 is 300% of 5, since
and 250% of 16 is(
)(16)=(2.5)(16)= 40. Note that the decimal equivalent of 250% is 2.5.
It is also not necessary for the part to be related to the whole at all, as in the question, "a teacher s salary is what percent of a banker s salary?"
When a quantity changes from an initial positive amount to another positive amount, for example, an employees salary that is raised, you can compute the amount of change as a percent of the initial amount. This is called percent change. If a quantity increases from 600 to 750, then the percent increase is found by dividing the amount of increase, 150, by the base, 600, which is the initial number given:
= 0.25 = 25%
We say the percent increase is 25%. Sometimes this computation is written as
(100%)=25%
If a quantity doubles in size, then the percent increase is 100%. For example, if a quantity changes from 150 to 300, then the percent increase is
= 100%
If a quantity decreases from 500 to 400, calculate the percent decrease as follows.
= 0.20 = 20%
The quantity decreased by 20%.
When computing a percent increase, the base is the smaller number. When computing a percent decrease, the base is the larger number. In either case, the base is the initial number, before the change.
转载请注明原文地址:https://tihaiku.com/zcyy/3355352.html
相关试题推荐
InevertrustedhimbecauseIalwaysthoughtofhimassucha______character.A、
Thegrowthofachildisinfluencedbyanumberoffactors,______arebeyondour
TheAmericanandtheBritish______alargenumberofsocialcustoms.A、joinB、tak
She()beillbecauseIsawherplayingtennisjustnow.A、can’tB、couldn’tC、must
Becauseofmanymistakes,shewasmade______theselettersagain.A、typeB、toty
Todaybooksare______toeveryonebecausetheyarenolongerexpensive.A、availa
Thegirlwasnothappyatthenewschoolbecauseshehad______friendsthere.A、fe
Becausethecompanywasdoingmorebusiness,itwasnecessaryto______thefactor
It’snouseringingmeupattheofficethisweekbecauseI’m______.A、bymyle
Idon’tliketodisturbyou,becauseyou’requitetired______today.A、ofB、with
随机试题
Itseemstomethattoday’sprime-timeleaderneedsatop-5listthatclearl
Theworld-renowneddirectorandactionactor_______thesymposiumonthedevelopm
化脓性关节炎和骨髓炎最常见的致病菌是()。A.溶血性链球菌 B.大肠杆菌
确诊流行性出血热的依据是A.鼠类接触史 B.全身感染和中毒症状 C.“三痛”
备用充电机应每()进行一次切换试验,带负荷运行一段时间,以确保其处于良好
社会工作者小林拟运用“生涯选择配合论”来帮助青少年进行生涯规划,协助他们更加清晰
公开增发的发行价格应不低于公告招股意向书前20个交易日公司股票均价或前一个交易日
药敏性口炎主要发生的变态反应类型是A.Ⅳ型 B.Ⅲ型 C.Ⅱ型 D.
C
有线电视系统中,把多路电视信号转换成一路含有多套电视节目的宽带复合信号的是(
最新回复
(
0
)