400-1816-180
本題由2提供
PS211-230
Seven pieces of rope have an average (arithmetic mean) length of 68 centimeters and a median length of 84 centimeters. If the length of the longest piece of rope is 14 centimeters more than 4 times the length of the shortest piece of rope, what is the maximum possible length, in centimeters, of the longest piece of rope?
A.82
B. 118
C. 120
D. 134
E. 152
登錄申友雷哥GMAT，查看答案及解析
視頻解析
資深講師題題有解析
文字解析
答案：
D
_,_,_,84,_,_
中位數(shù)84已經(jīng)固定，后三位不可能比84小，所以要保證最后一位足夠大的策略就是后兩位也為84，且前三位都取最小數(shù)。
設(shè)最小一位為x，則數(shù)列變?yōu)閤,x,x,84,84,84,4x+14。再根據(jù)7個(gè)數(shù)總和為476，算出x=30，則最大數(shù)4x+14為134。
GMAT會(huì)員
提交
┃熱門題目
- 【OG18-P680-668題】In a review of 2,000 studies of human behavior that date back to the 1940s, two Swiss psychologists, declaring that since most of the studies had failed to control for such variables as social class and family size, none could be taken seriously.
- 【OG18-P680-671題】Manufacturers rate batteries in watt-hours; if they rate the watt-hour higher, the longer the battery can be expected to last.
- 【OG18-P680-672題】At the end of the 1930s, Duke Ellington was looking for a composer to assist him-someone not only who could arrange music for his successful big band, but mirroring his eccentric writing style as well in order to finish the many pieces he had started but never completed.
- 【OG20-P569-634題】Snowmaking machines work by spraying a mist that freezes immediately on contact with cold air. Because the sudden freezing kills bacteria, QuickFreeze is planning to market a wastewater purification system that works on the same principle. The process works only when temperatures are cold, however, so municipalities using it will still need to maintain a conventional system. Which of the following, if true, provides the strongest grounds for a prediction that municipalities will buy QuickFreeze's purification system despite the need to maintain a conventional purification system as well?
- 【OG20-P147-8題】(12 -13 )+(13 -14 )+(14 -15 )+(15 -16 )=
┃OG視頻
┃最新資訊
┃最新出分
添加官方小助手微信
了解更多GMAT考試與咨詢
12G備考資料