When 1,000 children were inoculated with a certain vaccine, : GMAT Data Sufficiency (DS)
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# When 1,000 children were inoculated with a certain vaccine,

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

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25 Oct 2007, 07:42
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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, 05:25, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
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25 Oct 2007, 08:49
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!
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Re: GMAT prep 1, Q26 (DS) [#permalink]

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28 Oct 2007, 22:42
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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
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29 Oct 2007, 00:49
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.
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Re: When 1,000 children were inoculated with a certain vaccine [#permalink]

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11 May 2014, 04:48
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?
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Re: When 1,000 children were inoculated with a certain vaccine [#permalink]

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11 May 2014, 05:38
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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 6550 times ]

Theory on Overlapping Sets:
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.
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Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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03 Apr 2016, 08:26
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Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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21 Oct 2016, 22:51
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 954 times ]

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

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04 Jan 2017, 07:34
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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

Theory on Overlapping Sets:
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?
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Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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04 Jan 2017, 09:29
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

Theory on Overlapping Sets:
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.
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Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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04 Jan 2017, 10:11
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?
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Re: When 1,000 children were inoculated with a certain vaccine, [#permalink]

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05 Jan 2017, 02:34
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?

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Re: When 1,000 children were inoculated with a certain vaccine,   [#permalink] 05 Jan 2017, 02:34
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