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# If a motor is sound-insulated, then it is quiet enough to use in home

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If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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26 Jun 2018, 10:26
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Difficulty:

85% (hard)

Question Stats:

43% (01:45) correct 57% (01:52) wrong based on 447 sessions

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If a motor is sound-insulated, then it is quiet enough to use in home appliances. If a motor is quiet enough to use in home appliances, then it can be used in institutional settings. None of the motors manufactured by EM Industries are quiet enough to use in home appliances.

If the statements above are true, which one of the following must be true?

(A) If a motor can be used in institutional settings, then it is sound-insulated.
(B) None of the motors manufactured by EM Industries are sound-insulated.
(C) At least some of the motors manufactured by EM Industries can be used in institutional settings.
(D) If a motor is quiet enough to use in home appliances, then it is sound-insulated.
(E) None of the motors manufactured by EM Industries can be used in institutional settings.

Source: LSAT

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Posts: 10442
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Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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27 Jun 2018, 01:05
6
1
Akela wrote:
If a motor is sound-insulated, then it is quiet enough to use in home appliances. If a motor is quiet enough to use in home appliances, then it can be used in institutional settings. None of the motors manufactured by EM Industries are quiet enough to use in home appliances.

If the statements above are true, which one of the following must be true?

(A) If a motor can be used in institutional settings, then it is sound-insulated.
(B) None of the motors manufactured by EM Industries are sound-insulated.
(C) At least some of the motors manufactured by EM Industries can be used in institutional settings.
(D) If a motor is quiet enough to use in home appliances, then it is sound-insulated.
(E) None of the motors manufactured by EM Industries can be used in institutional settings.

Source: LSAT

It is an if-then conditional statement. First check out this post: https://www.veritasprep.com/blog/2012/1 ... tatements/

A implies B
and
Not B implies not A.

If a motor is sound-insulated, then it is quiet enough to use in home appliances.

A motor is sound-insulated means it is quiet enough to use in home appliances.
Not quiet enough to use in home appliances means it is not sound-insulated.

The argument tells us "None of the motors manufactured by EM Industries are quiet enough to use in home appliances". This means motors manufactured by EM Industries are not sound-insulated.

Note that in case of if statements, "not A does not imply not B"
So "not quiet enough to use in home appliances" does not imply "cannot be used in institutional settings".
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##### General Discussion
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Posts: 26
Location: United States
GMAT 1: 560 Q49 V18
GMAT 2: 660 Q47 V35
GPA: 4
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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26 Jun 2018, 22:12
I'm confused between options A, B and E. I took E. Kindly help
CR Forum Moderator
Joined: 25 Apr 2018
Posts: 629
GMAT 1: 680 Q49 V34
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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25 Jul 2019, 06:23
1
Akela wrote:
If a motor is sound-insulated, then it is quiet enough to use in home appliances. If a motor is quiet enough to use in home appliances, then it can be used in institutional settings. None of the motors manufactured by EM Industries are quiet enough to use in home appliances.

If the statements above are true, which one of the following must be true?

(A) If a motor can be used in institutional settings, then it is sound-insulated.
(B) None of the motors manufactured by EM Industries are sound-insulated.
(C) At least some of the motors manufactured by EM Industries can be used in institutional settings.
(D) If a motor is quiet enough to use in home appliances, then it is sound-insulated.
(E) None of the motors manufactured by EM Industries can be used in institutional settings.

Source: LSAT

-----------------------------------

Bumping this post for discussion!
Intern
Joined: 18 Jul 2018
Posts: 35
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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26 Jul 2019, 04:29
1
Akela wrote:
If a motor is sound-insulated, then it is quiet enough to use in home appliances. If a motor is quiet enough to use in home appliances, then it can be used in institutional settings. None of the motors manufactured by EM Industries are quiet enough to use in home appliances.

If the statements above are true, which one of the following must be true?

(A) If a motor can be used in institutional settings, then it is sound-insulated.
(B) None of the motors manufactured by EM Industries are sound-insulated.
(C) At least some of the motors manufactured by EM Industries can be used in institutional settings.
(D) If a motor is quiet enough to use in home appliances, then it is sound-insulated.
(E) None of the motors manufactured by EM Industries can be used in institutional settings.

Source: LSAT

It is an if-then conditional statement. First check out this post: https://www.veritasprep.com/blog/2012/1 ... tatements/

A implies B
and
Not B implies not A.

If a motor is sound-insulated, then it is quiet enough to use in home appliances.

A motor is sound-insulated means it is quiet enough to use in home appliances.
Not quiet enough to use in home appliances means it is not sound-insulated.

The argument tells us "None of the motors manufactured by EM Industries are quiet enough to use in home appliances". This means motors manufactured by EM Industries are not sound-insulated.

Note that in case of if statements, "not A does not imply not B"
So "not quiet enough to use in home appliances" does not imply "cannot be used in institutional settings".

Why it can that NONE... quiet enough.... implies NONE.....Industrial setting?
Manager
Joined: 10 Jun 2019
Posts: 122
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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02 Aug 2019, 03:04
This stimulus has conditonal reasoning and may need a fair bit diagramming.
When conditional reasoning is used in must be true then the correct answer is the repeat form or the contrapositive.Every other inference is wrong.
A. Mistaken reversal- Wrong
C.variant of Mistaken Negation
D.Another mistaken reversal
E.Another mistaken negation
Manager
Joined: 10 Jun 2019
Posts: 122
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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02 Aug 2019, 03:07
Srija221 wrote:
Akela wrote:
If a motor is sound-insulated, then it is quiet enough to use in home appliances. If a motor is quiet enough to use in home appliances, then it can be used in institutional settings. None of the motors manufactured by EM Industries are quiet enough to use in home appliances.

If the statements above are true, which one of the following must be true?

(A) If a motor can be used in institutional settings, then it is sound-insulated.
(B) None of the motors manufactured by EM Industries are sound-insulated.
(C) At least some of the motors manufactured by EM Industries can be used in institutional settings.
(D) If a motor is quiet enough to use in home appliances, then it is sound-insulated.
(E) None of the motors manufactured by EM Industries can be used in institutional settings.

Source: LSAT

It is an if-then conditional statement. First check out this post: https://www.veritasprep.com/blog/2012/1 ... tatements/

A implies B
and
Not B implies not A.

If a motor is sound-insulated, then it is quiet enough to use in home appliances.

A motor is sound-insulated means it is quiet enough to use in home appliances.
Not quiet enough to use in home appliances means it is not sound-insulated.

The argument tells us "None of the motors manufactured by EM Industries are quiet enough to use in home appliances". This means motors manufactured by EM Industries are not sound-insulated.

Note that in case of if statements, "not A does not imply not B"
So "not quiet enough to use in home appliances" does not imply "cannot be used in institutional settings".

Why it can that NONE... quiet enough.... implies NONE.....Industrial setting?

Conditional reasoning is strange. If you start thinking through it you will start making real life inferences that theis not supported by the LSAT Stimuli.Questions with conditonal reasoning and mut be true need to be diagrammed
Intern
Joined: 07 Aug 2017
Posts: 12
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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02 Aug 2019, 19:55
Was confused between B & E . But all that differentiate is a little attentiveness only. Re read to find out the logic.
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Status: As cheeks from my insta feed say: soon...
Joined: 16 Jan 2016
Posts: 67
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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05 Aug 2019, 19:30
Akela wrote:
If a motor is sound-insulated, then it is quiet enough to use in home appliances. If a motor is quiet enough to use in home appliances, then it can be used in institutional settings. None of the motors manufactured by EM Industries are quiet enough to use in home appliances.

If the statements above are true, which one of the following must be true?

(A) If a motor can be used in institutional settings, then it is sound-insulated.
(B) None of the motors manufactured by EM Industries are sound-insulated.
(C) At least some of the motors manufactured by EM Industries can be used in institutional settings.
(D) If a motor is quiet enough to use in home appliances, then it is sound-insulated.
(E) None of the motors manufactured by EM Industries can be used in institutional settings.

Source: LSAT

Conditional reasoning is some kind of magic. Don't reply to me, don't quote me. I am just happy that I finally started managing to solve 700 levels in CR (at least must be trues)
Intern
Joined: 13 Apr 2019
Posts: 2
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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06 Aug 2019, 05:31
If you are brief with the concepts of discrete mathematics, you'll find this solution easy to follow:
Sound insulated -----> Home appliances (1)
Home appliances -----> Industrial Appliances
motor (EM industries) ------> NOT home appliances (2)
home appliances -------> not (use) motor(EM industries) (3)

From (1) and (3) we follow
Sound insulated -----> not (use) motor(EM industries)
and hence
motor (EM industries) ------> (are) not Sound insulated

I know this seems tedious but if P then Q condition should be crystal clear in your list of concepts to tackle these type of questions quickly
Intern
Joined: 15 Jun 2015
Posts: 22
Re: If a motor is sound-insulated, then it is quiet enough to use in home  [#permalink]

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06 Aug 2019, 08:57
2
When do must be true question, i often draw a chart and it helps me a lot. If A, then B = A ->B. And we know contrapositive is correct. It means Not B -> Not A is correct. So apply this rule to this question:
A= a motor is sound-insulated
B= it is quiet enough to use in home appliances
C= it can be used in institutional settings
So, rewrite the stimulus we have: A - B; B->C ; and no motor manufactured byy.... is not B.

(A) If a motor can be used in institutional settings, then it is sound-insulated. rewrite C->A -> incorrect
(B) None of the motors manufactured by EM Industries are sound-insulated. rewrite not B->not A -> correct
(C) At least some of the motors manufactured by EM Industries can be used in institutional settings. -> incorrect
(D) If a motor is quiet enough to use in home appliances, then it is sound-insulated. -> B-> A -> incorrect
(E) None of the motors manufactured by EM Industries can be used in institutional settings. -> not B -> not C -> incorrect

Hence, B is correct. What if the stimulus does not have the if...then construction. i also pretend that it have this construction.

Thanks
Re: If a motor is sound-insulated, then it is quiet enough to use in home   [#permalink] 06 Aug 2019, 08:57