几道数学题求解答谢谢了！！！

Fervent · 发表于 2012-10-24 22:32:54

下面几题数学题求解答！！！谢谢了！！！！

There are how many hours between x minutes past 12 noon and 8:10 p.m of the same day, where x<60?
A.(490-x)/60
B.(480-x)/60
C.(470-x)/60
D.60*(60-x+7)
E.60*(60-x+17)
Answer: A

If it is 6:27 in the evening on a certain day, what time in the morning was it exactly 2,880,717 minutes earlier? (Assume standard time in one location.)
A.6:22
B.6:24
C.6:27
D.6:30
E.6:32
Answer

Jaime earned enough money by selling seashells at 25 cents each to buy several used paperback books at 55 cents each. If he spent all of the money he earned selling seashells to buy the books, what is the least number of seashells he could have sold ?
A.5 B.11 C.17 D.25 E.30
Answer: B

In a certain animal population, for each of the first 3 months of life, the probability that an animal will die during that months is 0.1. For a group of 200 newborn members of the population, approximately how many would be expected to survive the first 3 months of life?
A.140 B.146 C.152 D.162 E.170
Answer:B

If it is assumed that each of the n production workers in a factory assembles one instrument every t minutes, how many instruments does the factory assemble in 7.5 hours of production ?
A. 450n / t
B. 450t / n
C. 450nt
D. 7.5tn / 60
E. 7.5n /60t
Answer: A

On a recent trip, Cindy drove her car 290 miles, rounded to the nearest 10 miles, and used 12 gallons of gasoling, rounded to the nearest gallon. The actual number of miles per gallon that Cindy's car got on this trip must have been between
A. 290/12.5 and 290/11.5
B. 295/12 and 285/11.5
C. 285/12 and 295/12
D. 285/12.5 and 295/11.5
E. 295/12.5 and 285/11.5
Answer: D
这题我不解为什么不能选E。。。。

几道数学题求解答谢谢了！！！

所属分类: GMAT考试

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