作者enjoy1221 (恩)
看板GMAT
标题[计量] GWD14-11 14-26
时间Wed Sep 3 20:22:27 2008
Mary persuaded n friends to donate 500 each to her election
compaign, and then each of these n friends persuaded n more people to donate
500 each to Mary's compaign. If no one donated more than once and if there
were no other donations, what was the value of n?
1 THe first n people donated 1/16 of the total amount donated.
2 The total amount donated was 120000
Ans D 我选C耶
If the units digit of the three-digit positive integer k is nonzero, what
is the tens digit of k?
1 The tens digit of k+9 is 3
2 The tens digit of k+4 is 2
Ans A 我觉得第二个也可以
麻烦好心可以帮我一下
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1F：→ GGRIP:n/(n+n^2)=1/(1+n)=1/16,n=15 09/03 21:07
2F：→ GGRIP:12000/500=240=n+n^2=n(n+1),n=15 09/03 21:08
3F：→ GGRIP:k+9一定要进位，十位数+1，k+4不一定要进位 09/03 21:09