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Knewton Challenge: Win Knewton Shirt and GMAT Club Tests

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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]

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04 Sep 2011, 04:25
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04 Sep 2011, 07:34
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Quant 47-Striving for 50
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04 Sep 2011, 09:57
Conclusion: The marsupial lions were born with only their forelimbs developed only because they needed to climb into their mothers' pouches.
Thus the assumption is Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lions.Since there is already a use stated for the strong forelimbs(climbing into their mothers' pouches) thus forelimbs were developed.
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05 Sep 2011, 02:41
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05 Sep 2011, 19:47
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]

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05 Sep 2011, 20:17
Argument Structure:

A Kangaroo's forelimbs are well developed -> help to climb into mother's pouch
Ancient marsupial lions had only their forelimbs developed -> must have needed to climb to their mother's pouch

Prephrase:
Some connection between forelimbs development and climbing mother's pouch, saying former should lead to the later

(A) All animals that are born after a short gestation period are born with some parts of their bodies underdeveloped.

-- 'All' looks extreme, we are dealing with only 2 animals here and the argument is not primarily concerned about short gestation period

(B) Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.

-- The argument does not talk about the advantages of forelimbs and hind limbs. Out of scope

(C) If the newborn marsupial lion did not climb into its mother’s pouch, then paleontologists would be able to find evidence of this fact.

-- Whether the marsupial lion actually climbed into the pouch is not discussed in the argument and hence is out of scope. The conclusion just talks about the need to do so

(D) Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.

-- This could have been a possible assumption, had it not had 'only' in it. On negating, this becomes not only forelimbs developed but also other parts maybe. This answer choice doesn't yield the required result on negation, hence incorrect

(E) Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lions.

-- CORRECT ANSWER. This explains that the forelimbs were developed for some purpose. [From Argument climbing into mother's pouch is this purpose].
If said that the lions would have had their forelimbs developed even if they were of no use, we cannot say that marsupial lions needed to climb to mother's pouch [conclusion of the argument]
Conclusion is attached on negating the sentence, hence this is the Best Answer

Regards
Archana
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05 Sep 2011, 22:22
 ! The thread is closed for submissions. The winner will be announced on Tuesday.

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06 Sep 2011, 11:08
Hey everyone! Hope you enjoyed your long weekend, and thank you for all of your thoughtful responses! It was difficult choosing a winner, but we decided that the submission that most clearly and comprehensively explained the correct answer belonged to:

Mourinhogmat1!

Here's how he got it:

Evidence 1: For a new Kangaroo gestation period = 39days (SHORT GESTATION)
Evidence 2: Hind limbs are not well developed but Fore limbs are well developed. Why?
Evidence 3: So, that they can climb in to the pouch (Key word is So, that)
Main Conclusion: The evidence found in the lions strengthens the conclusion that developed forelimbs meant that they used this for climbing into the pouch of the adult lion.

Assumption should Eliminate a possibility of use of the fore limb or suggest some similiarity between Lions and Kangaroos.

A) INCORRECT. A addresses an assumption for Evidence 1, which is in fact irrelevant to the argument
B) INCORRECT. This highlights a relative comparison between the two limbs which is outside the scope of this argument.
C) INCORRECT. Outside the scope of this argument as well. Because it refers to a hypothetical possibility not relating to the evidence or the conclusion.
D) INCORRECT. This is the correct "wrong" answer. In fact this question talks about the possibility of not only this hind limbs. This statement talks about Fore limbs being the ONLY reason for the climbing. In fact this aspect of the argument is not discussed here. We only wish to know if the presence of a fore limb strengthens the fact that fore limbs are present for climbing into the pouch.
E) CORRECT. Try the negative test to confirm the answer: Newborn marsupial lions would not have had only their forelimbs developed if this development were used by the marsupial lions. This is also the only answer which connects the new born marsupials to the EVIDENCE OF ANCIENT MARSUPIALS (which maybe adults or young ones).

Fantastic job, mourinhogmat1!

A few Knewton pointers to clarify for those who were stumped by this question:

- When approaching critical reasoning problems, it's always a good idea to look at the question before the prompt. That way, you know what you're looking for when you're reading.

- In this question, we're looking for an assumption - the necessary bridge that leads from the evidence to the conclusion. As mourinhogmat1 did, the best way to approach this problem is to break down every piece of the prompt in order to figure out what is evidence, what is the author's conclusion, and what the unstated assumption is that links them.

- As mourinhogmat1 correctly determined, the first two sentences, as well as the first part of the third sentence, are evidence. The author's conclusion, therefore, is: (like kangaroos,) newborn marsupial lions must have needed to climb into their mothers' pouches.

- Thus, we have to look for the assumption that draws a connection between kangaroos and marsupial lions, or illustrates NEED. Let's look at each choice and see how well it fits this criteria:

A: The first thing that should strike you about this answer is the word "all." We're not concerned with all animals, we're only looking for a connection between kangaroos and marsupial lions. INCORRECT

B: This answer choice draws a false comparison. We're not concerned with how advantageous the forelimbs were, we just need to know if they were necessary. INCORRECT

C: The blurb doesn't mention paleontologists anywhere - this answer choice does not address the conclusion we're trying to support. Even if paleontologists were able to find evidence of it, this choice doesn't indicate the necessity of it. INCORRECT

D: This seems like the correct answer, and many students incorrectly fall for this option. The problem here is the misleading wording. Whether they COULD have climbed into their mothers' pouches doesn't support the conclusion that they NEEDED to. INCORRECT

E. This answer choice is tricky because of the confusing double negative wording. It's best to rephrase it, so that the meaning is more clear: "would not have developed if they were of no use" = "developed because they were of use" - this indicates development for a specific purpose, which supports the conclusion that marsupial lions NEEDED to develop forelimbs. CORRECT

Congratulations again to mourinhogmat1, look out for a private message with details on collecting your prize!

For everyone else, thank you again for your submissions! Did you guys enjoy this challenge competition? We'd love to hear some feedback on if you'd like us to continue/formatting improvements/anything else.

Thanks again, looking forward to your thoughts!

Jessie
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06 Sep 2011, 11:23
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Congratulations mourinhogmat1!!!
I liked the clue for what to look “Assumption should be…”, also the “correct wrong answer” concept/idea is highlighted, and finally the negation test (I wish it was used on D as well and I wish there was better formatting).

Also, I would like to thank all members who responded and would like to identify these members who got very close to winning:

gmatcracker24 – interesting approach; concise
Dhaswe – very direct and good explanation but a bit minimalistic
yogesh1984 – chose D but gave great reasoning
vamshikrishna – first post on GMAT Club and very clear logic but did not fully list why D was wrong (found only one of the reasons, though was enough to get to the correct answer)
a1choi – very good overview
karan2483 – great answer but the explanation of why D is wrong could be stronger
bficcade – also a first time poster. Did not address other answer choices except the correct one
abidshariff – Kudos for the multi-color use. Wish spent more time explaining the premise/conclusion/assumptions in the passage (what these concepts are)
alicegmat – Fantastic answer and was definitely one of the leading choices but it did not offer a glance at a “raw assumption” that one would come up with after reading the question. The strategy to answer the question in your own words without looking at the answer choices is not reflected here.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]

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09 Sep 2011, 11:06
Hello bb,

Quote:
alicegmat – Fantastic answer and was definitely one of the leading choices but it did not offer a glance at a “raw assumption” that one would come up with after reading the question. The strategy to answer the question in your own words without looking at the answer choices is not reflected here.

Point well taken! Thank you for pointing out a better approach to me! I had actually thought of an assumption ahead of time, and my linking bridge between premises and conclusion was that: Ancient marsupial lions would not have only well developed limbs, had they don't needed them to climb to mother's pouch.

As this was absent in the choices, I went for general use, as even without this, the conclusion would die!

My bridge for the gap was

Quote:
The argument's line of reasoning is that, as development of only forelimbs in kangaroos is for the purpose of Joey's climbing in its mother's pouch, the development of only forelimbs in ancient marsupial lions also implies that they needed to climb into their mother's pouch.
One of the assumptions made here is that the one definite purpose that only the forelimbs would develop in ancient marsupial lions would be to climb into their mother's pouch.

Thank you.
Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests   [#permalink] 09 Sep 2011, 11:06

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