请教筒子们一道DS数学题

猫猫咪伢 · 发表于 2011-9-17 16:18:25

Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary’s campaign.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
of the total amount donated.(2)The total amount donated was $120,000.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer:

答案是D 可我想不通

candybetter · 发表于 2011-9-17 16:38:22

根据句意，total amount=500(n+n^n ),只有一个未知数，给任意一个等式即可获得答案。

猫猫咪伢 · 发表于 2011-9-17 17:24:43

明白了，谢啦~

请教筒子们一道DS数学题

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