It is currently 17 Oct 2017, 01:08

### 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

# Events & Promotions

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

# When 1,000 children were inoculated with a certain vaccine,

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Manager
Joined: 11 Aug 2007
Posts: 64

Kudos [?]: 19 [2], given: 0

When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

25 Oct 2007, 08:42
2
This post received
KUDOS
10
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

66% (00:40) correct 34% (00:37) wrong based on 499 sessions

### HideShow timer Statistics

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever
(2) 20 children developed fever
[Reveal] Spoiler: OA

Last edited by Bunuel on 11 May 2014, 06:25, edited 1 time in total.
Renamed the topic, edited the question and added the OA.

Kudos [?]: 19 [2], given: 0

Manager
Joined: 11 Aug 2007
Posts: 64

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

### Show Tags

25 Oct 2007, 09:49
Oh, now I see that I mistakenly understood the second st.! I read it as 20 children developed fever but not inflammation.

Ok, that's it! Two CATs per day is too much!

Thanks!

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

Manager
Joined: 24 Jul 2007
Posts: 84

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

Re: GMAT prep 1, Q26 (DS) [#permalink]

### Show Tags

28 Oct 2007, 23:42
1
This post was
BOOKMARKED
elgo wrote:
Obviously, smth is wrong with my brain, but I couldn't understand the OA...

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever?

1. 880 children developed neither inflammation nor fever
2. 20 children developed fever

any thoughts?

The answer is C, combine the 2 statements and its sufficient

1000-880(neither)-20(fever) =100

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

GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5036

Kudos [?]: 436 [0], given: 0

Location: Singapore

### Show Tags

29 Oct 2007, 01:49
St1:
just tells us that #(inflmmation only) + #(fever only) + #(both fever and inflmmation) = 120. Insufficient.

St2:
Just tells us if #(fever and inflmmation) = x, then #(fever only) = 20-x. Insufficient.

St1 and St2:
#(inflmmation only) = I-x
#(inflmmation and fever) = x
#(fever only) = 20-x

So I-x + x + 20-x = 120
I-x = 100
#(inflmmation only) = 100

Sufficient.

Ans C

P.S: Solved using Venn Diagram.

Kudos [?]: 436 [0], given: 0

Intern
Joined: 07 May 2014
Posts: 21

Kudos [?]: 14 [0], given: 26

Re: When 1,000 children were inoculated with a certain vaccine [#permalink]

### Show Tags

11 May 2014, 05:48
It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

Kudos [?]: 14 [0], given: 26

Math Expert
Joined: 02 Sep 2009
Posts: 41872

Kudos [?]: 128493 [7], given: 12179

Re: When 1,000 children were inoculated with a certain vaccine [#permalink]

### Show Tags

11 May 2014, 06:38
7
This post received
KUDOS
Expert's post
3
This post was
BOOKMARKED
dhirajx wrote:
It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

No, you cannot assume that. It's vise-versa, if there is no overlap, then you'd be told that in one way or another.

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever
(2) 20 children developed fever

Attachment:

Untitled.png [ 16.6 KiB | Viewed 8938 times ]

Answer: C.

Theory on Overlapping Sets:
advanced-overlapping-sets-problems-144260.html
how-to-draw-a-venn-diagram-for-problems-98036.html

All DS Overlapping Sets Problems to practice: search.php?search_id=tag&tag_id=45
All PS Overlapping Sets Problems to practice: search.php?search_id=tag&tag_id=65

Hope this helps.
_________________

Kudos [?]: 128493 [7], given: 12179

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 16767

Kudos [?]: 273 [0], given: 0

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

03 Apr 2016, 09:26
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.
_________________

Kudos [?]: 273 [0], given: 0

Intern
Joined: 17 Jan 2014
Posts: 10

Kudos [?]: 2 [0], given: 11

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

21 Oct 2016, 23:51
Hello,

I tried solving this question through Venn Diagram. Putting the attachment here. Could anyone please let me know where am I lacking?
Total Sample = 1000
Neither I nor Fever = 880
Remaining = 120 with either Fever or Inf. or both.
Fever = 20

So, only Inflammation or Inflammation and fever = 100

And hence, according to me, I can't find the answer for the question, hence Statements are insufficient.
Attachments

Untitled.jpg [ 21.1 KiB | Viewed 3045 times ]

Kudos [?]: 2 [0], given: 11

Senior Manager
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 321

Kudos [?]: 866 [0], given: 28

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

04 Jan 2017, 08:34
Top Contributor
Bunuel wrote:
dhirajx wrote:
It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

No, you cannot assume that. It's vise-versa, if there is no overlap, then you'd be told that in one way or another.

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever
(2) 20 children developed fever

Attachment:
Untitled.png

Answer: C.

Theory on Overlapping Sets:
advanced-overlapping-sets-problems-144260.html
how-to-draw-a-venn-diagram-for-problems-98036.html

All DS Overlapping Sets Problems to practice: search.php?search_id=tag&tag_id=45
All PS Overlapping Sets Problems to practice: search.php?search_id=tag&tag_id=65

Hope this helps.

Bunnel - do you have a rule of thumb about when to use Venn Diagram and when to use matrix table?
_________________

press kudos, if you like the explanation, appreciate the effort or encourage people to respond.

Download the Ultimate SC Flashcards

Kudos [?]: 866 [0], given: 28

Math Expert
Joined: 02 Sep 2009
Posts: 41872

Kudos [?]: 128493 [0], given: 12179

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

04 Jan 2017, 10:29
dimitri92 wrote:
Bunuel wrote:
dhirajx wrote:
It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?

No, you cannot assume that. It's vise-versa, if there is no overlap, then you'd be told that in one way or another.

When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever
(2) 20 children developed fever

Attachment:
Untitled.png

Answer: C.

Theory on Overlapping Sets:
advanced-overlapping-sets-problems-144260.html
how-to-draw-a-venn-diagram-for-problems-98036.html

All DS Overlapping Sets Problems to practice: search.php?search_id=tag&tag_id=45
All PS Overlapping Sets Problems to practice: search.php?search_id=tag&tag_id=65

Hope this helps.

Bunnel - do you have a rule of thumb about when to use Venn Diagram and when to use matrix table?

For 2 groups I almost always use a matrix.
_________________

Kudos [?]: 128493 [0], given: 12179

Senior Manager
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 321

Kudos [?]: 866 [0], given: 28

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

04 Jan 2017, 11:11
Top Contributor
Thanks for the quick response Bunnel.
May be I am doing something wrong here and not seeing the right logic. I will appreciate your help here:
I don't see two groups. I see one group of kids who can either get one ailment or another. How do we decide if the groups are two or one?
_________________

press kudos, if you like the explanation, appreciate the effort or encourage people to respond.

Download the Ultimate SC Flashcards

Kudos [?]: 866 [0], given: 28

Math Expert
Joined: 02 Sep 2009
Posts: 41872

Kudos [?]: 128493 [0], given: 12179

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

05 Jan 2017, 03:34
dimitri92 wrote:
Thanks for the quick response Bunnel.
May be I am doing something wrong here and not seeing the right logic. I will appreciate your help here:
I don't see two groups. I see one group of kids who can either get one ailment or another. How do we decide if the groups are two or one?

Please check the matrix below:

_________________

Kudos [?]: 128493 [0], given: 12179

Director
Joined: 12 Nov 2016
Posts: 784

Kudos [?]: 35 [0], given: 164

Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

21 Mar 2017, 23:29
[quote="elgo"]When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever
(2) 20 children developed fever[/quote

In order to solve this question we need to know the number of children who developed neither and the number of children who developed fever- it is important to note this is a binary group- based on the stimulus it is assumed that there is no group that developed inflammation and fever at the site of inoculation.

Statement (1) gives us only one piece of the equation. Insufficient

Statement (2) still leaves us with the variable of the number of children who developed neither inflammation nor fever. Insufficient.

Statement (1) and Statement (2) together allow us the calculate the number of children who developed inflammation- only because there is no overlap with these groups

Total= A + B - Neither ( in this scenario A cannot be A + C (overlap) because it is inferred from the problem, again, you either have developed inflammation or have developed a fever)
1000= A + 20- 880
120= A + 20
100= A

Kudos [?]: 35 [0], given: 164

Senior Manager
Joined: 05 Jan 2017
Posts: 435

Kudos [?]: 59 [0], given: 15

Location: India
Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

### Show Tags

22 Mar 2017, 02:32
elgo wrote:
When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?

(1) 880 children developed neither inflammation nor fever
(2) 20 children developed fever

total = children(nothing) + children(fever only) +children (inflammation only) +children (both)
children(fever) = children(fever only) +children(both)

St1: 1000 = 880 + children(fever only) +children (inflammation only) +children (both). three variables. one equation.INSUFFICIENT
1000 = 880 +Children (fever) + Children (inflammation only)

St 2: 20 = children(fever only) +children(both)
therefore 1000 = children(nothing) + 20 +children (inflammation only)

St 1 & St 2: 1000 = 880 +20 +Children(inflammation only)

children (Inflammation only) = 100. ANSWER

Option C

Kudos [?]: 59 [0], given: 15

Re: When 1,000 children were inoculated with a certain vaccine,   [#permalink] 22 Mar 2017, 02:32
Display posts from previous: Sort by

# When 1,000 children were inoculated with a certain vaccine,

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne 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®.