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Inflammatio

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by gasg » Wed Jan 05, 2011 1:18 pm
When 1000 kids were inoculated, some got inflammation, others got fever. How many developed inflammation but not fever.
a. 880 developed neither inflammation nor fever
b. 20 children developed fever
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Source: — Data Sufficiency |
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by anshumishra » Wed Jan 05, 2011 3:28 pm
gasg wrote:When 1000 kids were inoculated, some got inflammation, others got fever. How many developed inflammation but not fever.
a. 880 developed neither inflammation nor fever
b. 20 children developed fever
Total = 1000 = F + I + B+ N
F -> got fever but no inflammation
I -> got inflammation but not fever
B ->got both
N -> got neither

I = ?

Statement 1:
N = 880
Still Insufficient

Statement 2 :
B+F = 20
Insufficient

Combining 1 and 2 :
N = 880
B+F = 20
Total = 1000 = N+B+F+I = 880+20 + I ----> Sufficient

Hence, C
Thanks
Anshu

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by Geva@EconomistGMAT » Wed Jan 05, 2011 11:21 pm
Image

Check out the table above - it's an excellent way to organize the information in sets questions such as this one.

Question stem goes in the total / total box

We want the inflame / no fever box:

Stat. (1) goes in No inflame / no fever box. cannot find the requested box from this. Insufficient.

Stat. (2) goes in the total / fever box. Going down the right column, we can now find total No fever = 1000-20 = 980, but alone this is still insufficient - missing the no inflame / no fever box.

combined: now that we have both boxes, we can go across the middle row: Inflame / no fever = 980-880 = 100. Sufficient. C.
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