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# If b and c are positive numbers and 1/b=b/c= c/8. What is

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Eternal Intern
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If b and c are positive numbers and 1/b=b/c= c/8. What is [#permalink]

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25 Jul 2003, 21:11
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If b and c are positive numbers and 1/b=b/c= c/8. What is b +C ?

VT

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GMAT Instructor
Joined: 07 Jul 2003
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Schools: Haas, MFE; Anderson, MBA; USC, MSEE
Re: PS: Good One, it's not simpler than you think [#permalink]

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26 Jul 2003, 08:24
AkamaiBrah wrote:
Curly05 wrote:
If b and c are positive numbers and 1/b=b/c= c/8. What is b +C ?

VT

roku

I II III IV V VI
un deux trois quatre cinq SIX
ichi ni san shi go ROKU
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AkamaiBrah
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993

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Manager
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26 Jul 2003, 09:57
Another vote for 6.

But I must admit that I've come up to an answer through substitution. 1/2=2/4=4/8.

Could somebody give me a hint how to find the answer using maths, please.
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Respect,

KL

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Eternal Intern
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26 Jul 2003, 10:55
Lyn,
Remember always think of one variable substitute another. It helps, I forget that at the beginning though.

1 b c
--- = --= --
b c 8

b^2= c c^2= 8b
b^2 ^2= 8b
b^4= 8b
b^3= 8
b= 2
and substitute
it in for
b^2=c
2^2=c
4=c

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