Last visit was: 22 Apr 2026, 19:36 It is currently 22 Apr 2026, 19:36
Home
Messages
Tests
Schools
Events
Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
rishi2377
User avatar
Joined: 18 Jun 2007
Last visit: 25 Mar 2009
Posts: 125
Own Kudos:
318
Posts: 125
Kudos: 318
PS: Prep 09 Feb 2008, 14:34
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

History

Date
Time
Result
Not Attempted Yet
This spun my head. perhaps I am mising something.
please explain.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
srp
User avatar
Joined: 02 Jan 2008
Last visit: 01 May 2009
Posts: 76
Own Kudos:
274
Posts: 76
Kudos: 274
PS: Prep Updated on: 09 Feb 2008, 14:39
Originally posted by srp on 09 Feb 2008, 14:38.
Last edited by srp on 09 Feb 2008, 14:39, edited 1 time in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
why? It's not E? :-D
User avatar
neelesh
User avatar
Joined: 20 Dec 2004
Last visit: 25 May 2019
Posts: 129
Own Kudos:
653
 [1]
Posts: 129
Kudos: 653
 [1]
PS: Prep 09 Feb 2008, 14:39
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
1 hr.

1/A + 1/B = 5/6
1/A + 1/C = 2/3
1/B + 1/C = 1/2

2(1/A+1/B+1/C) = 5/6 + 4/6 + 3/6 = 12/6

(1/A + 1/B + 1/C) = 1

Hence 1 hr.
User avatar
rishi2377
User avatar
Joined: 18 Jun 2007
Last visit: 25 Mar 2009
Posts: 125
Own Kudos:
318
Posts: 125
Kudos: 318
PS: Prep 09 Feb 2008, 14:52
Kudos
Add Kudos
Bookmarks
Bookmark this Post
lol! yes OA is E. I guess I am a bit too tired.
thx .
avatar
pmenon
avatar
Joined: 28 Dec 2005
Last visit: 01 Jul 2009
Posts: 691
Own Kudos:
619
Given Kudos: 2
Posts: 691
Kudos: 619
PS: Prep 09 Feb 2008, 17:11
Kudos
Add Kudos
Bookmarks
Bookmark this Post
i know we are looking for 1/a+1/b+1/c, but why do you multiply by 2, and where do you get the numbers for 1/a, 1/b and 1/c from ?
User avatar
GMATBLACKBELT
User avatar
Joined: 29 Mar 2007
Last visit: 03 Jun 2013
Posts: 1,138
Own Kudos:
1,911
Posts: 1,138
Kudos: 1,911
PS: Prep 11 Feb 2008, 16:46
Kudos
Add Kudos
Bookmarks
Bookmark this Post
neelesh
1 hr.

1/A + 1/B = 5/6
1/A + 1/C = 2/3
1/B + 1/C = 1/2

2(1/A+1/B+1/C) = 5/6 + 4/6 + 3/6 = 12/6

(1/A + 1/B + 1/C) = 1

Hence 1 hr.
Show more


Wow +1 for this. Thats very creative. This prob took me a whopping 4min b/c I was tryin to manipulate and just got messed up all over the place.

neelesh is multiplying (1/A+1/B+1/C) by 2 b/c all 3 equations give us just this.

1/A + 1/B = 5/6
1/A + 1/C = 2/3
1/B + 1/C = 1/2

See how we have 2 of every variable?

Again very nice!
User avatar
rishi2377
User avatar
Joined: 18 Jun 2007
Last visit: 25 Mar 2009
Posts: 125
Own Kudos:
318
Posts: 125
Kudos: 318
PS: Prep 12 Feb 2008, 07:13
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Black belt, All we needed was the value of 1/a + 1/b + 1/c and neelesh did smart thing by getting it by adding all 3 equations... nice manipulation.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Moderator:
Bunuel
Math Expert
109754 posts