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问答题At the eating contest the winner ate an average of 15 hot dogs at the first 20 sittings. After a further 20 sittings the average increased to 20 hot dogs. What was the average for the last 20 sittings?

题目
问答题
At the eating contest the winner ate an average of 15 hot dogs at the first 20 sittings. After a further 20 sittings the average increased to 20 hot dogs. What was the average for the last 20 sittings?
参考答案和解析
正确答案： 25.
解析：
前20轮共吃汉堡300个，40轮下来共吃汉堡800个，则后20轮吃汉堡500个，因此每轮吃25个。
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相似问题和答案

第1题：

共用题干
第一篇

Heat and Health

Extremely hot weather is common in many parts of the world.Although hot weather just
makes most people hot,it can cause medical problems and death.
Health experts say that since the year 1900,extremely hot weather has killed more
people in the United States than any other natural event.One year一the unusually hot
summer of 1980一heat caused about 1,700 deaths in the United States.In 1995,more
than 600 people died in a similar heat wave in one city一Chicago.
To measure extreme heat,government weather experts have developed the Mean Heat
Index.It measures the average of how hot it is felt all day on an extremely hot day.Experts
say it is the total heat of a hot day or several hot days that can affect health.Several hot
days are considered a heat wave.Experts say heat waves often become deadly when the
nighttime temperature does not drop much from the highest daytime temperature.
The most common medical problem caused by hot weather is heat stress.It is also
least severe.For most people,the only result of heat stress is muscle pain.The pain is a
warning that the body is becoming too hot. Doctors say drinking water will help the pain
disappear after the body again has the right amounts of water and salt.For some people,
however,the result is much more serious.
For example,doctors say some people face a greatly increased danger from heat
stress.These people have a weak or damaged heart,high blood pressure,or other
problems of the blood system.Severe heat can help cause a heart attack or stroke.Health
experts say this is the most common cause of death linked to hot weather.

What can people learn from the Mean Heat Index?
A:The average temperature of an extremely hot day.
B:The highest temperature of an extremely hot day.
C:The lowest temperature of an extremely hot day.
D:The nighttime temperature of an extremely hot day.

答案：B
解析：

第2题：

For an inventory report, you created a work_in_progress that contains two columns, ID_number and quantity. The parent group of the work_in_progress is in_inventory which contains one column, dept_no. You added a filter of fist fifteen to total_inventory and a filter of last 20 for work_in_progress. Which records will the report return?（）

  • A、First 15 dept_no values. 
  • B、Last 20 ID_no and quantity values with the first 15 dept_no values for each work_in_progress value. 
  • C、First 15 dept_no values with the last 20 ID_number and quantity values for each total_inventory value. 
  • D、First 15 dept_no values and the last 20 ID_no and quantity values. 
  • E、The last 20 ID_number and quantity values.

正确答案:C

第3题：

Foraninventoryreport,youcreatedawork_in_progressthatcontainstwocolumns,ID_numberandquantity.Theparentgroupofthework_in_progressisin_inventorywhichcontainsonecolumn,dept_no.Youaddedafilteroffistfifteentototal_inventoryandafilteroflast20forwork_in_progress.Whichrecordswillthereportreturn?（）

A.First15dept_novalues.

B.Last20ID_noandquantityvalueswiththefirst15dept_novaluesforeachwork_in_progressvalue.

C.First15dept_novalueswiththelast20ID_numberandquantityvaluesforeachtotal_inventoryvalue.

D.First15dept_novaluesandthelast20ID_noandquantityvalues.

E.Thelast20ID_numberandquantityvalues.


参考答案：C

第4题：

What call performance statistics are reported on the Cisco Wireless IP Phone 7921 user interface?（）

  • A、minimum jitter
  • B、maximum jitter
  • C、upstream standard packet deviation
  • D、average MOS value
  • E、average conceal rate

正确答案:D

第5题：

在Excel中，函数AVERAGE（3，5，7，5）的值是（）。

  • A、5
  • B、4
  • C、20

正确答案:A

第6题：

在Excel中，函数average(6,10，20)的值为()。

A、10
B、11
C、12
D、13

答案：C
解析：
函数average(6，10，20)表示求6、10、20三个数的平均值，即(6+10+20)/3=12。

第7题：

翻译：With Average or With Particular Average（WA or WPA）（）


正确答案:水渍险

第8题：

EXCEL2003中，在单元格中输入=20AVERAGE(7,9)，将显示()。

A.TRUE

B..T.

C.FALSE

D.YES


正确答案：A


第9题：

What will cause wireless voice devices to perform poorly？（）

  • A、average signal strength that is greater than -67 dBi
  • B、cell overlap of 15 to 20 percent
  • C、uneven wireless coverage
  • D、absence of coverage holes

正确答案:C

第10题：

单选题
The graph below represents the average points per game of a certain basketball player from 1995-2000. What is the percent increase over the 6-year period to the nearest hundredth of a percent?
A

18%

B

18.18%

C

20%

D

22%

E

22.22%


正确答案： E
解析：
Divide the change in average points by the average points in 1995. Percent increase =(22-18)/18=4/18= 22.22%.

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