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Mary persuaded n friends to donate $500 each to her election

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Mary persuaded n friends to donate $500 each to her election [#permalink]

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New post 16 Sep 2008, 13:28
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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 1/16 of the total amount donated.

(2) The total amount donated was $120,000.

Last edited by vksunder on 17 Sep 2008, 11:11, edited 1 time in total.

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Re: DS: Equations [#permalink]

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New post 16 Sep 2008, 14:35
vksunder wrote:
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 161 of the total amount donated.

(2) The total amount donated was $120,000.



Statement 1 doesn't make sense. Are you sure there isn't a typo here?

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Senior Manager
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Joined: 10 Mar 2008
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Re: DS: Equations [#permalink]

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New post 17 Sep 2008, 11:11
I've corrected the error. Sorry!

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Re: DS: Equations [#permalink]

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New post 17 Sep 2008, 23:22
D.

Total donation = 500n + 500n^2

From stmt1: 16(500n + 500n^2) = 500n....hence n = 15....sufficient.

From stmt2: 500n + 500n^2 = 120000.....can be solved for n....sufficient.

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Re: DS: Equations   [#permalink] 17 Sep 2008, 23:22
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Mary persuaded n friends to donate $500 each to her election

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