Five years ago, during the first North American outbreak of : GMAT Critical Reasoning (CR)
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# Five years ago, during the first North American outbreak of

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Five years ago, during the first North American outbreak of [#permalink]

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02 Jan 2004, 12:46
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13. Five years ago, during the first North American outbreak of the cattle disease CXC, the death rate from the disease was 5 percent of all reported cases, whereas today the corresponding figure is over 18 percent. It is clear, therefore, that during these past 5 years, CXC has increased in virulence.

Which one of the following, if true, most substantially weakens the argument?

(A) Many recent cattle deaths that have actually been caused by CXC have been mistakenly attributed to another disease that mimics the symptoms of CXC.

(B) During the first North American outbreak of the disease, many of the deaths reported to have been caused by CXC were actually due to other causes.

(C) An inoculation program against CXC was recently begun after controlled studies snowed inoculation to be 70 percent effective in preventing serious cases of the illness.

(D) Since the first outbreak, farmers have learned to treat mild cases of CXC and no longer report them to veterinarians or authorities.

(E) Cattle that have contracted and survived CXC rarely contract the disease a second time.
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SVP
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02 Jan 2004, 13:26
asandeep can you explain your logic in chosing D
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02 Jan 2004, 13:33
anandnk wrote:
asandeep can you explain your logic in chosing D

This is a simple mathematical reasoning question.

Suppose,
the number of reported cases = 100
number of deaths among reported cases = 5
Therefore, % of deaths = 5

Now, if
the number of reported cases goes down to = 20
number of deaths among reported cases still remains the same = 5
% of deaths = 25

But, since the percentage has increased does that mean the disease is more dangerous ?
Option D says that many cases were not reported, that means that the death percentage was for a lower number of cases.
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02 Jan 2004, 13:50
Hmm, I thought otherwise. Since farmers are not reporting many cases that means there are even more number of diseases unaccounted for. But I forgot to notice that the percentages are of death rates and not the disease itself.
02 Jan 2004, 13:50
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