[計量] 我還有問題想要請教?
1.the average (arithmetic mean) of a set of 12 numbers,which includes 34,is N
if 34 is removed the set and 38 is added to the set,what is the average of
the new set of numbers,in terms of N?
a)N+1/3 b)N+6/19 c)N+4 d)N+6 e)12N+4
2.a train travels from city X to city Y in 3 hours and 30 mins at an average
speed of 60 mile per hour.if the train returns at an average speed of 50
miles per hour,how lonf does the return trip take?
a)2 hr 55 min b)3hr 40 min c)4 hr 12 min d)4 hr 32 min e)4 hr 40 min
3.if 18 identical machines required 40 days to complete a job,how many fewer
days would have been required to do the job if 6 addirional machines of the
same type had been used from the beginning?
a)10 b)13又1/3 c)16 d)26又2/3 3)36
4.of the positive integers that are multiples of 30 and are less than or equal
to 360,what fraction are mutiples of 12?
a)1/6 b)1/5 c)1/3) d)2/5 e)1/2
**我是有把數字列出來30的倍數且小於360的有:30,60,90,120,150,180,210,240,270
300,330,360可是第二句就不大懂意思了?是翻成12倍數的分數是甚麼嗎?@@"
可是我除了1/2的答案，也要算出1/5耶!!!
5.a decrease of 1 in which of the factors bove would result in the greatest
decrease in the product?
a)11 b)13 c)17 d)19 e)23
6.worker W produce n units in 5 hours. wokers V and W,working independently
but at the same time,produce n units in 2 hours.how long would it take V
alone to produce n units?
a)1 hr 2 min b)1 hr 53 min c)2 hr 30 min d)3 hr 20 min e)3 hr 30 min
**圖表題我也錯很多，可是不知道要怎麼問?@@"
謝謝你們的解釋!!!^^
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推
05/12 11:54, , 1F
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04/13 23:38,
7年前
, 12F
04/13 23:38, 12F
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