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When 1,000 children were inoculated with a certain vaccine

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Manager
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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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C
D
E

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80% (01:32) correct 20% (01:42) wrong based on 5 sessions
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?
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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.
  [#permalink] 29 Oct 2007, 00:49
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