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b and c................

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Manager
Manager
Joined: 02 Sep 2008
Posts: 103
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Kudos [?]: 10 [0], given: 1

b and c................ [#permalink] New post 26 Apr 2009, 13:10
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (02:25) correct 0% (00:00) wrong based on 1 sessions
If b and c are positive numbers and (1/b)=(b/c)=(c/8) , then b + c =
(A) 4
(B) 6
(C) 7
(D) 8
(E) 9
Senior Manager
Senior Manager
Joined: 01 Mar 2009
Posts: 372
Location: PDX
Followers: 5

Kudos [?]: 62 [0], given: 24

GMAT Tests User
Re: b and c................ [#permalink] New post 26 Apr 2009, 14:16
6

From the equation you have
1. 1/b = b/c => b^2=c
2. 1/b=c/8 So bc = 8

From 1 and 2 you have b^3 = 8 or b = 2
Substitute this in 2 and you have c=4

b+c=6
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Re: b and c................   [#permalink] 26 Apr 2009, 14:16
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