题库搜索>问题求解PS-13298
The average (arithmetic mean) cost per book for the 12 books on a certain table is k dollars. If a book that costs 18 dollars is removed from the table and replaced by a book that costs 42 dollars, then in terms of k, what will be the average cost per book, in dollars, for the books on the table?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
12本书的总cost为12k,减去18再加上42为换上新书后的总Cost,然后在除以12为每本书的cost.就是(12k-18+42)/12 化简后是k+2
科目:
问题求解PS
来源:
GWD
1m56s
平均耗时
79.5%
平均正确率
该题由网友ZxTfNqX提供
点击上传问题求解PS -16754
【OG20-P148-15题】Over the past 7 weeks, the Smith family had weekly grocery bills of $74, $69 ,$64, $79, $64, $84, and $77. What was the Smiths’ average(arithmetic mean) weekly grocery bill over the 7-week period?
问题求解PS -16747
【OG20-P163-114题】The table shows partial results of a survey in which consumers were asked to indicate which one of six promotional techniques most influenced their decision to buy a new food product .Of those consumers who indicated one of the four techniques listed ,what fraction i...
问题求解PS -16745
【OG20-P167-134题】10 ,4 ,26 ,16What is the median of the number shown ?
问题求解PS -16744
【OG20-P148-17题】During a recent storm ,9 neighborhoods experienced power failures of durations 34,29,27,46,18,25,12,35,and 16 minutes ,respectively .For these 9 neighborhoods ,what was the median duration ,in minutes ,of the power failures ?
问题求解PS -16740
【OG20-P146-3题】During a trip that they took together ,Carmen ,Juan ,Maria ,and Rafael drove an average (arithmetic mean )of 80 miles each. Carmen drove 72 miles ,Juan drove 78 miles ,and Maria drove 83 miles .How may miles did Rafael drive ?
问题求解PS -16754
【OG20-P148-15题】Over the past 7 weeks, the Smith family had weekly grocery bills of $74, $69 ,$64, $79, $64, $84, and $77. What was the Smiths’ average(arithmetic mean) weekly grocery bill over the 7-week period?
问题求解PS -16747
【OG20-P163-114题】The table shows partial results of a survey in which consumers were asked to indicate which one of six promotional techniques most influenced their decision to buy a new food product .Of those consumers who indicated one of the four techniques listed ,what fraction i...
问题求解PS -16745
【OG20-P167-134题】10 ,4 ,26 ,16What is the median of the number shown ?
问题求解PS -16744
【OG20-P148-17题】During a recent storm ,9 neighborhoods experienced power failures of durations 34,29,27,46,18,25,12,35,and 16 minutes ,respectively .For these 9 neighborhoods ,what was the median duration ,in minutes ,of the power failures ?
问题求解PS -16740
【OG20-P146-3题】During a trip that they took together ,Carmen ,Juan ,Maria ,and Rafael drove an average (arithmetic mean )of 80 miles each. Carmen drove 72 miles ,Juan drove 78 miles ,and Maria drove 83 miles .How may miles did Rafael drive ?