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

It is currently 25 Jan 2015, 22:29

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

Recently Mary gave a birthday party for her daughter at

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Joined: 04 Jan 2008
Posts: 120
Followers: 2

Kudos [?]: 20 [0], given: 0

Recently Mary gave a birthday party for her daughter at [#permalink] New post 13 Sep 2008, 01:53
7
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

41% (02:36) correct 59% (01:45) wrong based on 292 sessions
Recently Mary gave a birthday party for her daughter at which she served both chocolate and strawberry ice cream. There were 8 boys who had chocolate ice cream, and nine girls who had strawberry. Everybody there had some ice cream, but nobody tried both. What is the maximum possible number of girls who had some chocolate ice cream?

(1) Exactly thirty children attended the party.
(2) Fewer than half the children had strawberry ice cream.
[Reveal] Spoiler: OA
VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1434
Followers: 35

Kudos [?]: 245 [0], given: 1

Re: Zumit DS 025 [#permalink] New post 13 Sep 2008, 12:44
ssandeepan wrote:
IMO E..

Total number of girls is not known from any of the statements..also this question looks awkward..


Yepp. I chose E. Total number of children is a level above the distinction of boys and girls. Children includes both.
Senior Manager
Senior Manager
avatar
Joined: 31 Jul 2008
Posts: 309
Followers: 1

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

Re: Zumit DS 025 [#permalink] New post 13 Sep 2008, 13:18
A

as we need the maximum no. of girls
VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1405
Followers: 7

Kudos [?]: 138 [0], given: 0

Re: Zumit DS 025 [#permalink] New post 13 Sep 2008, 23:37
dancinggeometry wrote:
Recently Mary gave a birthday party for her daughter at which she served both chocolate and strawberry ice cream. There were 8 boys who had chocolate ice cream, and nine girls who had strawberry. Everybody there had some ice cream, but nobody tried both. What is the maximum possible number of girls who had some chocolate ice cream?

(1) Exactly thirty children attended the party.
(2) Fewer than half the children had strawberry ice cream.


1)is INSUFFI no info about the number of icecreams !!!
2)does not say about total number of children !!!

(1) and (2) =>
say g_c=girls having choc ice cream and boys b_s boys having strawber icecream then
g_c+b_s +17=30 => g_c+b_s=13 => when b_s=0 then g_c = max = 13

IMO C
_________________

cheers
Its Now Or Never

VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1405
Followers: 7

Kudos [?]: 138 [0], given: 0

Re: Zumit DS 025 [#permalink] New post 13 Sep 2008, 23:39
spriya wrote:
dancinggeometry wrote:
Recently Mary gave a birthday party for her daughter at which she served both chocolate and strawberry ice cream. There were 8 boys who had chocolate ice cream, and nine girls who had strawberry. Everybody there had some ice cream, but nobody tried both. What is the maximum possible number of girls who had some chocolate ice cream?

(1) Exactly thirty children attended the party.
(2) Fewer than half the children had strawberry ice cream.


1)is INSUFFI no info about the number of icecreams !!!
2)does not say about total number of children !!!

(1) and (2) =>
say g_c=girls having choc ice cream and boys b_s boys having strawber icecream then
g_c+b_s +17=30 => g_c+b_s=13 => when b_s=0 then g_c = max = 13

IMO C

Question says maximum possible number of girls hence i chose C
OA plsss
_________________

cheers
Its Now Or Never

GMAT Instructor
avatar
Joined: 24 Jun 2008
Posts: 978
Location: Toronto
Followers: 275

Kudos [?]: 764 [0], given: 3

Re: Mary - party [#permalink] New post 19 Nov 2009, 12:17
kairoshan wrote:
Recently Mary gave a birthday party for her daughter at which she served both chocolate and strawberry ice cream. There were 8 boys who had chocolate ice cream, and nine girls who had strawberry. Everybody there had some ice cream, but nobody tried both. What is the maximum possible number of girls who had some chocolate ice cream?

(1) Exactly thirty children attended the party.

(2) Fewer than half the children had strawberry ice cream.


This doesn't make any logical sense as a DS question - a DS question cannot ask for the 'maximum number' of something, since it is impossible to know what kind of information would be sufficient to answer such a question. Simplifying matters, if I ask, for example,

What is the maximum possible number of stamps in Bill's collection?
1) Bill has fewer than 30 stamps in his collection.
2) Bill has an even number of stamps in his collection.

From Statement 1, we know the maximum possible is 29, but from Statements 1+2 together we know the maximum is 28. So is Statement 1 sufficient alone? Or do we need both? Or is the answer E? The question doesn't have a unique correct answer, and is completely illogical - you could never see such a question on the real GMAT. The same is true of the question in the original post above. I'd be curious to know the source of the original question, but it's best ignored.
_________________

Nov 2011: After years of development, I am now making my advanced Quant books and high-level problem sets available for sale. Contact me at ianstewartgmat at gmail.com for details.

Private GMAT Tutor based in Toronto

Senior Manager
Senior Manager
avatar
Joined: 24 Mar 2011
Posts: 466
Location: Texas
Followers: 4

Kudos [?]: 70 [0], given: 20

Re: Zumit DS 025 [#permalink] New post 14 Jun 2011, 14:54
Yeh the Question is strange, however i found this today in MGMAT test. And naturally didnt do it right, so thought to check what other people think of such question.

Answer could be explained as follows, however i am not still very convinced or i should say that it is just a 'hidden trap' of gmat.

Attachment:
cs.JPG
cs.JPG [ 5.58 KiB | Viewed 3125 times ]


From statement 1- Total = 30 kids.

to maximize, girls eating choclate icecream, boys eating strawberry could be assumed!! to be 0, since it is not stated that there must be atleast one boy who eats strawberry icecream.

so the max girls eating choclate icecream will be - 30-8-9 = 13 girls.

st-2 doesnt provide info on boys choclate icecream.

-------------------------------------------------
the trap is that one may not assume that boys eating strawberry icecream could be 0, and think that st-1 may not be sufficient.

so in that case both statements would be required.

but the idea is to read the word 'maximum' in the Question.
Intern
Intern
User avatar
Joined: 15 May 2013
Posts: 18
GPA: 3.3
WE: Other (Consulting)
Followers: 0

Kudos [?]: 2 [0], given: 31

Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 18 Apr 2014, 05:00
What should be done in such a case?.

Is the answer - A , C or E?

Any Expert Opinion?
_________________

GMAT - I'm gonna eat you whole ..!! ;)

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 25243
Followers: 3916

Kudos [?]: 34871 [0], given: 3995

Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 18 Apr 2014, 10:20
Expert's post
Senior Manager
Senior Manager
avatar
Joined: 28 Apr 2014
Posts: 291
Followers: 0

Kudos [?]: 26 [0], given: 46

GMAT ToolKit User
Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 05 May 2014, 22:48
Bunuel wrote:
pkhats wrote:
What should be done in such a case?.

Is the answer - A , C or E?

Any Expert Opinion?


The OA for this question is A.


Could you explain this please Bunuel ?
Intern
Intern
avatar
Joined: 25 May 2014
Posts: 3
Followers: 0

Kudos [?]: 0 [0], given: 20

Recently Mary gave a birthday party for her daughter at [#permalink] New post 20 Jul 2014, 01:28
This is how I think A is sufficient

Out of 30 children, to get the maximum value of girls eating chocolate ice-cream, we should choose minimum # of boys to eat strawberry ice-cream... (to be fair to the boys, I chose 1 strawberry ice-cream for them and got 12 girls eat chocolate ice-cream :) )...

(refer to the matrix picture posted by agdimple333)

let me know if my approach is incorrect.
Intern
Intern
avatar
Joined: 31 Mar 2014
Posts: 1
Location: India
Concentration: Marketing, Technology
GMAT Date: 09-07-2014
GRE 1: 302 Q152 V150
WE: Analyst (Consulting)
Followers: 0

Kudos [?]: 0 [0], given: 8

Recently Mary gave a birthday party for her daughter at [#permalink] New post 26 Jul 2014, 06:43
1) Total children = 30
Let total girls be x.
Therefore total boys = 30-x

Now to get the max of Girls-Chocolatte (a) we have to maximize x.
To maximize x , Boys-Strawberry has to be zero.
Then 30-x=8
 X=22

Now a+9=22
 A=13
Thus statement 1 sufficient.
2) Insufficient : Since total is not known hence insufficient.
Attachments

Book1-page-001.jpg
Book1-page-001.jpg [ 48.66 KiB | Viewed 1162 times ]

Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Status: Tomorrow will be a new day...
Joined: 22 Mar 2013
Posts: 971
Location: India
GMAT Date: 01-06-2015
GPA: 3.51
WE: Information Technology (Computer Software)
Followers: 80

Kudos [?]: 538 [0], given: 217

Premium Member CAT Tests
Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 31 Aug 2014, 03:41
1) As we have 30 children and we know that 8 boys had chocolate and 9 girls had strawberry, we are left with 30-17=13. These 13 can be considered girls who had chocolate. Question is asking maximum possible girls who had chocolate thus we can assume these 13 as girls who had choco ice cream. No need to calculate anything.
_________________

Piyush K
-----------------------
Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time. ― Thomas A. Edison
Don't forget to press--> Kudos :)
My Articles: 1. WOULD: when to use? | 2. All GMATPrep RCs (New)
Tip: Before exam a week earlier don't forget to exhaust all gmatprep problems specially for "sentence correction".

Manager
Manager
avatar
Joined: 02 May 2014
Posts: 91
Followers: 0

Kudos [?]: 13 [0], given: 45

Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 23 Dec 2014, 04:05
as we need maximum number of girls having chocolate ice cream then we are given 8 boys with chocolate ice cream so for maximum girls we have limit the number of boys to minimum that is out to 30 children rest 13 must be girls. Hence option A. hope this one helps.
Intern
Intern
avatar
Joined: 13 Jan 2015
Posts: 3
Followers: 0

Kudos [?]: 1 [0], given: 4

Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 22 Jan 2015, 08:44
Please forgive me if I am being dumb, if nobody tried both strawberry and chocolate, how are we going to have people who tried both of them??
Director
Director
User avatar
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 512
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: 340 Q170 V170
Followers: 19

Kudos [?]: 95 [0], given: 6

Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 22 Jan 2015, 11:55
Hi All,

I imagine that many Test Takers would misinterpret the information in the prompt.....UNTIL they read the information in Fact 1, then they'd catch the error.

To start, we're given some information on SOME of the children who attended a party:
1) There were 8 boys who had chocolate ice cream
2) There were 9 girls who had strawberry ice cream
3) NOBODY had both flavors of ice cream
4) EVERYBODY had ice cream.

The misinterpretation is that there were only 17 children at the party. The prompt does NOT state that, so we have to keep an open mind to the idea that there were MORE children and that we don't know what type of ice cream THOSE children ate. The specific question asks for the MAXIMUM POSSIBLE number of girls who had chocolate ice cream, so THAT also implies that there were additional children beyond the 17 described.

Fact 1: 30 children attended the party.

Here we have an actual number to work with. 30 total children - the 17 mentioned in the prompt = 13 additional children. We don't know if they're boys or girls and we don't know whether they ate chocolate or strawberry ice cream. All of that is fine - the question is asking for the maximum POSSIBLE number of girls who COULD have had chocolate ice cream. IF those 13 extra children were ALL girls and IF they ALL had chocolate ice cream.....then that would make the maximum possible = 13.
Fact 1 is SUFFICIENT.

Fact 2: Fewer than half the children had strawberry ice cream.

Since we know that 9 had strawberry and 8 had chocolate, this Fact also implies that there were additional children. Unfortunately, we don't know how many. There would have to be AT LEAST 2 extra children, but it could be dozens or hundreds and we have no idea about whether they're male or female or what type of ice cream each ate.
Fact 2 is INSUFFICIENT.

Final Answer:
[Reveal] Spoiler:
A


GMAT assassins aren't born, they're made,
Rich
_________________

Rich Cohen
Rich.C@empowergmat.com
http://www.empowergmat.com

Expert Post
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 5135
Location: Pune, India
Followers: 1242

Kudos [?]: 6029 [0], given: 171

Re: Recently Mary gave a birthday party for her daughter at [#permalink] New post 22 Jan 2015, 23:02
Expert's post
Tmoni26 wrote:
Please forgive me if I am being dumb, if nobody tried both strawberry and chocolate, how are we going to have people who tried both of them??


We don't have any people who tried both and no solution has considered both.

As for the solution to this question, the question is not correct. It is a DS question - you need to find out whether the given data is sufficient to answer the question. So it is illogical to ask for a maximum or minimum value. The maximum or minimum values change with information. The more relevant information you provide, the more restricted the range becomes and hence the maximum changes.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Save $100 on Veritas Prep GMAT Courses And Admissions Consulting
Enroll now. Pay later. Take advantage of Veritas Prep's flexible payment plan options.

Veritas Prep Reviews

Re: Recently Mary gave a birthday party for her daughter at   [#permalink] 22 Jan 2015, 23:02
    Similar topics Author Replies Last post
Similar
Topics:
Today is Angelina birthday. She invited four friends to her devilmirror 10 01 Feb 2006, 13:56
A child had 5 friends at her birthday party. The children study 12 23 Oct 2008, 19:21
Recently Mary gave a birthday party for her daughter at asaf 1 26 Aug 2007, 13:00
At 10th birthday party, X received 30 candies. He was then HIMALAYA 6 07 Nov 2005, 18:55
At his 10th birthday party, a child received 30 candies. He ValleyBall1 2 07 Nov 2005, 11:16
Display posts from previous: Sort by

Recently Mary gave a birthday party for her daughter at

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.