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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] New post 25 Oct 2007, 07:42
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62% (01:44) correct 38% (00:30) wrong based on 85 sessions
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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 [#permalink] New post 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] New post 28 Oct 2007, 22:42
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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 [#permalink] New post 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] New post 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] New post 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:
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Untitled.png [ 16.6 KiB | Viewed 1152 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.
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Re: When 1,000 children were inoculated with a certain vaccine   [#permalink] 11 May 2014, 05:38
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