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# How can we find the numbers by second equation

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VP
Joined: 18 May 2008
Posts: 1300
Followers: 13

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How can we find the numbers by second equation [#permalink]  12 Jun 2008, 18:19
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How can we find the numbers by second equation?
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SVP
Joined: 04 May 2006
Posts: 1936
Schools: CBS, Kellogg
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Re: Gmatprep- DS question [#permalink]  12 Jun 2008, 18:34
the first number is a
the sixth number is a+5

6a+15=105, a=...
and n=...
_________________
VP
Joined: 18 May 2008
Posts: 1300
Followers: 13

Kudos [?]: 171 [0], given: 0

Re: Gmatprep- DS question [#permalink]  12 Jun 2008, 21:58
Oh my god! how could i be so dumb? ignoring such a simple fact.
Re: Gmatprep- DS question   [#permalink] 12 Jun 2008, 21:58
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