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

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Manager
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26 Apr 2009, 14:10
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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
Joined: 01 Mar 2009
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26 Apr 2009, 15:16
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, 15:16
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