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

It is currently 16 Apr 2014, 16:56

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If Carmen had 12 more tapes, she would have twice as many

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Joined: 09 Dec 2009
Posts: 122
Followers: 3

Kudos [?]: 21 [0], given: 19

If Carmen had 12 more tapes, she would have twice as many [#permalink] New post 26 Jan 2010, 19:36
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

62% (02:34) correct 37% (02:25) wrong based on 8 sessions
Hey folks - long time lurker, first time poster. Looking for some alternative methods or explanations for 2 questions from the OG. I just can't seem to wrap my head around them and the official explanations aren't helping.

152. If Carmen had 12 more tapes, she would have twice as many as Rafael. Does Carmen have fewer tapes than Rafael?

(1) Rafael has more than 5 tapes
(2) Carmen has fewer than 12 tapes

[Reveal] Spoiler: OA
B


161. Beginning in January of last year Carl made deposits of $120 into his account on the 15th of each month for several consecutive months and then made withdrawals of $50 from the account on the 15th of each of the remaining months last year. There were no other transactions in the account last year. If the closing balance of Carl's account for May of last year was $2600, what was the range of the monthly closing balances of Carl's account last year?

(1) Last year the closing balance of Carl's account for April was less than $2625
(2) Last year the closing balance of Carl's account for June was less than $2675

[Reveal] Spoiler: OA
C


I'm stumped. :?:

In a way, I'm hoping I missed something obvious here. Thanks for the help!
_________________

G.T.L. - GMAT, Tanning, Laundry

Round 1: 05/12/10 handling-a-grenade-thesituation-s-official-debrief-94181.html

Round 2: 07/10/10 - This time it's personal.

4 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 17283
Followers: 2868

Kudos [?]: 18334 [4] , given: 2345

GMAT Tests User CAT Tests
Re: OG !2th Ed. DS 152, 161 [#permalink] New post 27 Jan 2010, 04:41
4
This post received
KUDOS
Expert's post
Currency wrote:
Hey folks - long time lurker, first time poster. Looking for some alternative methods or explanations for 2 questions from the OG. I just can't seem to wrap my head around them and the official explanations aren't helping.

I'm stumped. :?:

In a way, I'm hoping I missed something obvious here. Thanks for the help!


Hi, welcome to the club.

If Carmen had 12 more tapes, she would have twice as many as Rafael. Does Carmen have fewer tapes than Rafael?

(1) Rafael has more than 5 tapes
(2) Carmen has fewer than 12 tapes

Given c+12=2r, question is c<r?

(1) r>5. If r=6>5, c=0 --> c<r BUT if r=14>5, c=16 --> c>r. Two different answers. Not sufficient.

(2) c<12. Max number of tapes Carol can have is 10 (for c=11, r=11.5 is not an integer, thus this value for c is not good, as c and r are the # of tapes, thus they must be integers). c_max=10, r=11 --> c<r. Sufficient (if for c_max we got that c<r, then for all other possible values of c, c<r will also hold true).

Answer: B.


Beginning in January of last year Carl made deposits of $120 into his account on the 15th of each month for several consecutive months and then made withdrawals of $50 from the account on the 15th of each of the remaining months last year. There were no other transactions in the account last year. If the closing balance of Carl's account for May of last year was $2600, what was the range of the monthly closing balances of Carl's account last year?

(1) Last year the closing balance of Carl's account for April was less than $2625
(2) Last year the closing balance of Carl's account for June was less than $2675

To find the range we should know:
A. Balance before he started depositing, initial balance = x (we know that there was initial balance because for May balance was 2600 and maximum amount he could deposited for this period is: 5 months*120=600).
B. Till what month he deposited $120.
C. From which month he started withdrawing $50.

(1) April balance< 2625 --> he deposited in May
(Because if he didn't then April balance=2600+50=2650 and we know that in April balance was<2625).
So for may balance=2600=x(initial balance)+5months*120 --> x+600=2600 --> x=2000.
We know initial balance, but we still don't know: till what month he deposited $120 and from which month he started withdrawing $50
Not sufficient

(2) June balance < 2675 --> he didn't deposited in June --> he withdrawn in June (if he deposited, in June deposit would be May balance 2600+120=2720>2675)
Not sufficient

(1)+(2) we know:
Initial balance: x=2000
Till what month he deposited $120: till May
From which month he started withdrawing $50: from June
Sufficient.

Answer: C.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Manager
Manager
User avatar
Joined: 09 Dec 2009
Posts: 122
Followers: 3

Kudos [?]: 21 [0], given: 19

Re: OG !2th Ed. DS 152, 161 [#permalink] New post 27 Jan 2010, 09:56
Thanks Bunuel,

+1 response.

I had to stare at them for a minute but was able to "get it" eventually. It's a pain but ones that I have a difficult time grasping I end up learning the most from.

I appreciate it.
_________________

G.T.L. - GMAT, Tanning, Laundry

Round 1: 05/12/10 handling-a-grenade-thesituation-s-official-debrief-94181.html

Round 2: 07/10/10 - This time it's personal.

VP
VP
User avatar
Joined: 09 Sep 2013
Posts: 1085
Followers: 120

Kudos [?]: 29 [0], given: 0

Premium Member
Re: If Carmen had 12 more tapes, she would have twice as many [#permalink] New post 26 Feb 2014, 03:16
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: If Carmen had 12 more tapes, she would have twice as many   [#permalink] 26 Feb 2014, 03:16
    Similar topics Author Replies Last post
Similar
Topics:
New posts If she were I, she would have accepted the prize if she had navneetaron 3 30 Mar 2005, 10:41
New posts If Carmen had 12 more tapes, she would have twice as many jaynayak 2 18 Jun 2006, 02:51
New posts If Carmen had 12 more tapes, she would have twice as many goalsnr 3 18 May 2008, 15:43
New posts 1 Experts publish their posts in the topic If Carmen had 12 more tapes, she would have twice as many nina11 4 25 Feb 2012, 08:33
New posts 2 If George had 16 more textbooks, he would have three times tim415 6 27 Dec 2012, 08:56
Display posts from previous: Sort by

If Carmen had 12 more tapes, she would have twice as many

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.