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When exercising the muscles in one’s back, it is important

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When exercising the muscles in one’s back, it is important [#permalink]

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When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.

Source: LSAT
[Reveal] Spoiler: OA

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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 19 Sep 2017, 05:14
broall wrote:
When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.

Source: LSAT


The assumption is C - Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.
Negating this, will break the argument.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 19 Sep 2017, 05:54
When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.





Using POE....



(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.---Incorrect--- The passage does not state anything like this..(too extreme)

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.---Incorrect---Author does not talk about unbalanced muscle development, he rather talks about balanced muscle development..(out of scope)

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.---Correct--If this is not true the argument falls apart.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.---Incorrect---The passage does not state anything like this..(too extreme)


(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.---Incorrect---The passage does not state anything like this..(generalization)




---



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When exercising the muscles in one’s back, it is important [#permalink]

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New post Updated on: 20 Sep 2017, 00:24
Ans B?
It starts with equal exercise then subtly switches to balanced development

Originally posted by Octobre on 19 Sep 2017, 09:37.
Last edited by Octobre on 20 Sep 2017, 00:24, edited 2 times in total.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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Premise: When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally.
Conclusion: balanced muscle development is needed to maintain a healthy back
Premise: since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment. [ I had marked this as the answer, but I guess I am wrong. Was confused between A and B]. in the premise it is mentioned we need a balanced muscle development, but option A uses the phrase " equally well developed" which I do not think is the same.
If I try to negate it and say that it will not be enough to keep the back in proper alignement, it weakens the argument. Will be happy if someone can shed more light on my analysis.]


(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development. [If we negate this, we can easily say that this has to be the answer, because if exercising the muscles unequally does not tend to lead to unbalanced muscle development, then it would shatter the argument! Hence this has to be the answer.]

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.[this is already mentioned, so this can't be an assumption!]

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged. [Out of Scope - No mention of irreparably damaged

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.[Nothing is mentioned about daily exercise - out of scope.]

So, looks like the answer should be B. But someone please highlight where is the mistake in my thought process in A.


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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 19 Sep 2017, 15:45
which one is the right answer finally? I go with be using the negation test
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 23 Sep 2017, 10:52
The OA is B.

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Re: When exercising the muscles in one’s back, it is important [#permalink]

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When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

This is an assumption question and we have to find that missing information which is crucial for the argument to hold.

If we boil it down we get --> exercise the muscles on opposite sides of the spine equally will help maintain a healthy back.
Missing information: The author takes it for granted that exercising the muscles on the opposite sides of the spine equally is THE only way to maintain a healthy back.

In more difficult assumption questions it is difficult to separate a missing information and a strengthener. Most of the options given do strengthen the argument but are they essential for the argument is something that we need to find out.

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.
It certainly strengthens the argument but not necessary for the conclusion to hold true. If we negate the option we get "muscles on opposite sides of the spine that are equally well developed will not be enough to keep the back in proper alignment." It does not affect the argument because it doesn't even talk about the exercising the muscles.


(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.
This, too, will strengthen the argument but not an essential information to have.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.
It's too extreme. We can't say for sure that the back will be irreparably damaged. We only know that one might have an unhealthy back.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.
Exercising daily/weekly/monthly cannot be assumed. Eliminate. This option is an easy out.


(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.
B is the winner. If we negate the option we "exercising the muscles on opposite sides of the spine unequally DOESN'T tends to lead to unbalanced muscle development" the conclusion falls apart.

Expert's feedback is appreciated if my logic is incorrect.

Thank you
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 03 Oct 2017, 11:54
Can anyone please explain to me why option C is incorrect? When I negated the to option, it seemed to weaken the conclusion.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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Can anyone please explain to me why option C is incorrect? When I negated the to option, it seemed to weaken the conclusion.

I am happy to help :-)

The problem with this statement is the word "generally". This means that sometimes one will have a healthy back and sometimes one will not have a healthy back.

This is not necessary for the argument to hold.

Also, if you negate the option "Provided that one exercises the muscles on opposite sides of the spine equally, one will NOT have a GENERALLY healthy back" which also means that sometimes one will have a healthy back and sometimes one will not have a healthy back and that's how it doesn't do anything to the argument.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 03 Oct 2017, 21:56
Very interesting question. The answer is B

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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 04 Oct 2017, 07:00
KB04 wrote:
Can anyone please explain to me why option C is incorrect? When I negated the to option, it seemed to weaken the conclusion.

I am happy to help :-)

The problem with this statement is the word "generally". This means that sometimes one will have a healthy back and sometimes one will not have a healthy back.

This is not necessary for the argument to hold.

Also, if you negate the option "Provided that one exercises the muscles on opposite sides of the spine equally, one will NOT have a GENERALLY healthy back" which also means that sometimes one will have a healthy back and sometimes one will not have a healthy back and that's how it doesn't do anything to the argument.



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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 07 Oct 2017, 14:23
broall wrote:
When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.

Source: LSAT


I think the word "MUST" in the premise - "since the muscles on opposite sides of the spine MUST pull equally in opposing directions to keep the back in proper alignment and protect the spine." - has made the choice B correct choice
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 09 Oct 2017, 18:03
broall wrote:
When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.

Source: LSAT


The main stimulus talks during the exercise, where as the option C talks about the general statement of having a healthy back if one exercise the muscles. In case of Option B, it clearly mentions "during the exercise if done unequally, it will lead to unbalanced muscle development" which on negating will falsify the conclusion.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 10 Dec 2017, 23:37
GMATNinjaTwo wrote:
The OA is B.

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Hi,
I was torn between B and C. C looks more like an inference or conclusion to me. but, on a second thought C can be an assumption, that falls under If X then Y.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

If one exercises the muscles on opposite sides of the spine equally, then one will have a generally healthy back.
If we negate this, if one exercises the muscles on opposite sides of the spine equally, then one will not have a generally healthy back. The argument falls. Please help me to understand how to eliminate C.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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broall wrote:
When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.

Source: LSAT
B. Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

Since we have two negative words we can paraphrase the sentence as below;
Exercising the muscles on opposite sides of the spine equally tends to lead to balanced muscle development.

So, by negating we get,
Exercising the muscles on opposite sides of the spine DOES NOT equally tends to lead to balanced muscle development.

This breaks down the conclusion, thereby, it is a correct assumption.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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New post 11 Dec 2017, 00:30
Mahmud6 wrote:
broall wrote:
When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.

Source: LSAT
B. Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

Since we have two negative words we can paraphrase the sentence as below;
Exercising the muscles on opposite sides of the spine equally tends to lead to balanced muscle development.

So, by negating we get,
Exercising the muscles on opposite sides of the spine DOES NOT equally tends to lead to balanced muscle development.

This breaks down the conclusion, thereby, it is a correct assumption.

Hi Mahmud6,
Yes option B by negating, we can see the conclusion breaks. Can you kindly mention how C is incorrect. Even by negating C, the conclusion breaks.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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sunny91 wrote:
Mahmud6 wrote:
broall wrote:
When exercising the muscles in one’s back, it is important, in order to maintain a healthy back, to exercise the muscles on opposite sides of the spine equally. After all, balanced muscle development is needed to maintain a healthy back, since the muscles on opposite sides of the spine must pull equally in opposing directions to keep the back in proper alignment and protect the spine.

Which one of the following is an assumption required by the argument?

(A) Muscles on opposite sides of the spine that are equally well developed will be enough to keep the back in proper alignment.

(B) Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

(D) If the muscles on opposite sides of the spine are exercised unequally, one’s back will be irreparably damaged.

(E) One should exercise daily to ensure that the muscles on opposite sides of the spine keep the back in proper alignment.

Source: LSAT
B. Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

Since we have two negative words we can paraphrase the sentence as below;
Exercising the muscles on opposite sides of the spine equally tends to lead to balanced muscle development.

So, by negating we get,
Exercising the muscles on opposite sides of the spine DOES NOT equally tends to lead to balanced muscle development.

This breaks down the conclusion, thereby, it is a correct assumption.

Hi Mahmud6,
Yes option B by negating, we can see the conclusion breaks. Can you kindly mention how C is incorrect. Even by negating C, the conclusion breaks.
Hi sunny91,

Though I am still learning, I will try to present my reasoning.

The word 'generally' means 'in most cases' or 'usually'. So, to paraphrase the choice C, it stands-

'provided that one exercises the muscles on opposite sides of the spine equally, one will have a healthy back in most cases'

So, by negating we get,

'provided that one exercises the muscles on opposite sides of the spine equally, one will NOT have a healthy back in most cases ---> which indicates that if one exercises the muscles on opposite sides of the spine equally, in some cases one will have a healthy back.

I hope this doesn't break down the conclusion.
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Re: When exercising the muscles in one’s back, it is important [#permalink]

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Mahmud6 wrote:
sunny91 wrote:
Mahmud6 wrote:
B. Exercising the muscles on opposite sides of the spine unequally tends to lead to unbalanced muscle development.

Since we have two negative words we can paraphrase the sentence as below;
Exercising the muscles on opposite sides of the spine equally tends to lead to balanced muscle development.

So, by negating we get,
Exercising the muscles on opposite sides of the spine DOES NOT equally tends to lead to balanced muscle development.

This breaks down the conclusion, thereby, it is a correct assumption.

Hi Mahmud6,
Yes option B by negating, we can see the conclusion breaks. Can you kindly mention how C is incorrect. Even by negating C, the conclusion breaks.
Hi sunny91,

Though I am still learning, I will try to present my reasoning.

The word 'generally' means 'in most cases' or 'usually'. So, to paraphrase the choice C, it stands-

'provided that one exercises the muscles on opposite sides of the spine equally, one will have a healthy back in most cases'

So, by negating we get,

'provided that one exercises the muscles on opposite sides of the spine equally, one will NOT have a healthy back in most cases ---> which indicates that if one exercises the muscles on opposite sides of the spine equally, in some cases one will have a healthy back.

I hope this doesn't break down the conclusion.

Thanks Mahmud6 for the reply!

Let's look at the passage in terms of necessary and sufficient conditions. We are told that "balanced muscle development is needed to maintain a healthy back". Does that mean that balanced muscle development is SUFFICIENT to maintain a healthy back? Maybe not. Consider the following example:

    A great GMAT score is needed to get accepted to LBS.

So if you get a great GMAT score, will you get accepted to LBS? Maybe, maybe not. Getting a great GMAT score is a NECESSARY condition, but it is not sufficient. You might need a great GMAT score, an outstanding essay, solid referrals, impressive work experience, etc. Similarly, having balanced muscle development is NECESSARY to maintaining a healthy back, but it might not be sufficient. You might need balanced muscle development, lots of flexibility, great posture, healthy vertebrae, etc.

Now take a look at choice (C):

Quote:
(C) Provided that one exercises the muscles on opposite sides of the spine equally, one will have a generally healthy back.

Just because you exercise the muscles on opposite sides equally, does not necessarily mean you'll have balanced muscle development. And even if you have balanced muscle development, you might have an unhealthy back for other reasons.

The passage describes a NECESSARY condition, but choice (C) turns it into a (generally) SUFFICIENT condition. 100 people might have balanced muscle development, but half of them (or more) might have unhealthy backs for other reasons. This doesn't change the fact that having balanced muscle development is a NECESSARY condition. Thus, choice (C) is not a required assumption.

I hope that helps!
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