求大神指导下列几道GWD数学题

Geogre · 发表于 2014-8-13 17:51:50

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1.Running at their respective constant rates,machines X takes 2 days longer to produce w widgets than machine Y. At these rate, if the two machines together produce  5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?
A.4  B.5  C.8 D.10 E.12
2.If n=8的11次方-8， what is  units digit of n?
A.0 B.1 C.4 D.6 E.8
3. For any positive integer n, the sum of the forst n positive integers equals [n(n+1)/2]. What is the sum of all the even integers between 99 and 301?
A.10100 B.20200 C.22650 D.40200 E.45150
4.A positive integer n is said to be "prime-saturated"if the product of all the different positive prime factors of n is less than the square root of n. What is the greatest two-digit prime-saturated integer?
A.99 B.98 C.97 D.96 E.95

求大神指导下列几道GWD数学题

所属分类: GMAT考试

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