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by Soumita » Fri Nov 16, 2012 2:24 pm
can anyone help me with this question:

Trancorp currently transports all its goods to Burland
Island by truck. The only bridge over the channel
separating Burland from the mainland is congested,
and trucks typically spend hours in traffi c. Trains can
reach the channel more quickly than trucks, and
freight cars can be transported to Burland by barges
that typically cross the channel in an hour. Therefore,
to reduce shipping time, Trancorp plans to switch to
trains and barges to transport goods to Burland.

Which of the following would be most important to
know in determining whether Trancorp's plan, if
implemented, is likely to achieve its goal?

(A) Whether transportation by train and barge would
be substantially less expensive than
transportation by truck
(B) Whether there are boats that can make the trip
between the mainland and Burland faster than
barges can
(C) Whether loading the freight cars onto barges is
very time consuming
(D) Whether the average number of vehicles
traveling over the bridge into Burland has been
relatively constant in recent years
(E) Whether most trucks transporting goods into Burland return to the mainland empty

Why not B??why C??boat can be used to make the trip if it is found that it is faster than train and burges. So it is important to know in determining whether Trancorp's plan, if
implemented, is likely to achieve its goal.

Please let me explain me.. I got stuck !!
Source: — Critical Reasoning |

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by GMAT Kolaveri » Fri Nov 16, 2012 8:23 pm
Soumita wrote:can anyone help me with this question:
Why not B??why C??boat can be used to make the trip if it is found that it is faster than train and burges. So it is important to know in determining whether Trancorp's plan, if
implemented, is likely to achieve its goal.

Please let me explain me.. I got stuck !!


Why not B ?
Read closely the question stem again and decide what the question expects you to answer.
The question asks you find out a deciding factor or do a feasibility study of the plan. The plan has already been decided to use Trains instead of Trucks. The question does not ask you to suggest an alternate plan, which is given by the option B. Option B could be the answer for a different type of question such as "how would you argue against this plan?". But the question "Which of the following would be most important to know in determining whether Trancorp's plan, if implemented, is likely to achieve its goal?" expects a different answer.

Why C?
The question asks you to verify whether the plan if implemented would be successful.
Now lets consider C "Whether loading the freight cars onto barges is very time consuming?"

The answer could be either YES. It is very time consuming. In that case plan will not be successful.
If the answer to the question C is NO, then the plan will be successful if implemented.

The above statements answers the question " whether Trancorp's plan, if implemented, is likely to achieve its goal? "

Important CR tip:
Read closely the question stem and know exactly what the question expects the test-taker to do.
This is especially important in the tough CR question (700+ range ).

Also read all the options before choosing the correct answer. Most test taker would have fallen for option B and would have moved on to the next question. See how the test makers have placed a clever-incorrect-answer-option(B) right before the correct option (C).

So read the question stem closely and know exactly what is expected.
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by Soumita » Fri Nov 16, 2012 10:24 pm
Thanks a lot..

Can you please explain this question also:

Certain genetically modified strains of maize produce a
powerful natural insecticide. The insecticide occurs
throughout the plant, including its pollen. Maize pollen
is dispersed by the wind and frequently blows onto
milkweed plants that grow near maize fields.
Caterpillars of monarch butterflies feed exclusively
on milkweed leaves. When these caterpillars are
fed milkweed leaves dusted with pollen from modified
maize plants, they die. Therefore, by using genetically
modified maize, farmers put monarch butterflies at risk.

Which of the following would it be most useful to
determine in order to evaluate the argument?
(A) Whether the natural insecticide is as effective
against maize-eating insects as commercial
insecticides typically used on maize are
(B) Whether the pollen of genetically modifi ed maize
contains as much insecticide as other parts of
these plants
(C) Whether monarch butterfl y caterpillars are
actively feeding during the part of the growing
season when maize is releasing pollen
(D) Whether insects that feed on genetically
modified maize plants are likely to be killed by
insecticide from the plant's pollen
(E) Whether any maize-eating insects compete with
monarch caterpillars for the leaves of milkweed plants growing near maize fields

OA is C

D: if it is true then the argument that using genetically
modified maize killed butterflies is true. If it is false then the argument is false.

C: if yes then the argument is true. If it is false then the argument is false.

I am not understanding how to eliminate D and keep C.

Thanks a lot for your continuous help.

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by GMAT Kolaveri » Sat Nov 17, 2012 5:09 am
Soumita wrote:Thanks a lot..

When these caterpillars are
fed milkweed leaves dusted with pollen from modified
maize plants, they die. Therefore, by using genetically
modified maize, farmers put monarch butterflies at risk.

Which of the following would it be most useful to
determine in order to evaluate the argument?

(C) Whether monarch butterfl y caterpillars are
actively feeding during the part of the growing
season when maize is releasing pollen
(D) Whether insects that feed on genetically
modified maize plants are likely to be killed by
insecticide from the plant's pollen

D: if it is true then the argument that using genetically
modified maize killed butterflies is true. If it is false then the argument is false.

C: if yes then the argument is true. If it is false then the argument is false.

I am not understanding how to eliminate D and keep C.
The conclusion speaks specifically about endangering 'Monarch bufferflies'. And we are asked to evaluate this argument concerning 'Monarch bufferflies'. Option D speaks about insects. D can be eliminated as OOS Out of Scope of the argument.
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