Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 28 May 2015, 22:45

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# b and c are postive numbes and 1/b=b/c=c/8 What is b+c? For

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Manager
Joined: 01 Sep 2003
Posts: 73
Location: NYC
Followers: 0

Kudos [?]: 1 [0], given: 0

b and c are postive numbes and 1/b=b/c=c/8 What is b+c? For [#permalink]  09 Nov 2003, 12:46
b and c are postive numbes and 1/b=b/c=c/8

What is b+c?

For b, I am getting 1/8 and c=1

The choices are

4
6
7
8
9
Manager
Joined: 26 Aug 2003
Posts: 233
Location: United States
Followers: 1

Kudos [?]: 2 [0], given: 0

[#permalink]  09 Nov 2003, 16:45
I get 6.

...weird problem though!
Manager
Joined: 01 Sep 2003
Posts: 73
Location: NYC
Followers: 0

Kudos [?]: 1 [0], given: 0

Hey [#permalink]  09 Nov 2003, 17:03
6 is the answer, how did you get it?
SVP
Joined: 03 Feb 2003
Posts: 1608
Followers: 6

Kudos [?]: 78 [0], given: 0

[#permalink]  10 Nov 2003, 23:48
{b^2=c
{c^2=8b

b and c are not zeroes

solve the system and get b=2 and c=4

2+4=6
Manager
Joined: 26 Aug 2003
Posts: 233
Location: United States
Followers: 1

Kudos [?]: 2 [0], given: 0

Re: Hey [#permalink]  11 Nov 2003, 12:27
ftoor wrote:
6 is the answer, how did you get it?

To try a quick way, I looked at only the first two parts, disregarding c/8, because they give me some information about relation between b and c.
1/b=b/c
b┬▓ = c

Here since you know c = b┬▓, you could use this information in the equation b + c.
b + c
= b + b┬▓
= b(b + 1)

This tells us that the answer should be the product of b and it's immediate follower: the only answer that satisfies this condition is 6. 2(2 + 1) = 2*3 = 6.

Of course, the drawback of this technique is that you have to go with an intuition that b is an integer, otherwise you end up back and top and start all over again. But that doesn't take too long... probably like 30-40 seconds.
Intern
Joined: 11 Nov 2003
Posts: 30
Location: CA
Followers: 1

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

[#permalink]  11 Nov 2003, 13:00
from 1/b=b/c=c/8
b^2=c & b*c=8

So,
b* (b^2)=8
b=2

b*c=8
2*c=8
c=4
[#permalink] 11 Nov 2003, 13:00
Similar topics Replies Last post
Similar
Topics:
6 What is the value of (a! + b!)(c! + d!)? 5 05 Nov 2014, 07:43
1 If a, b, and c are positive and a =b/c^1/2, what is the 2 21 Jul 2014, 21:03
4 What is the value of (a! + b!)(c! + d!)? 11 10 May 2011, 09:09
What is the value of a^2b/c? 1. a=1/b and c=1/a 2. b=c and 4 18 Nov 2008, 13:41
For integers a, b, c, a / (b-c) = 1. What is the value of 7 09 Jan 2008, 10:36
Display posts from previous: Sort by

# b and c are postive numbes and 1/b=b/c=c/8 What is b+c? For

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.