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All etching tools are either pin-tipped or bladed. While some bladed

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All etching tools are either pin-tipped or bladed. While some bladed  [#permalink]

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New post 02 Dec 2018, 09:32
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All etching tools are either pin-tipped or bladed. While some bladed etching tools are used for engraving, some are not. On the other hand, all pin-tipped etching tools are used for engraving. Thus, there are more etching tools that are used for engraving than there are etching tools that are not used for engraving.

The conclusion of the argument follows logically if which one of the following is assumed?

(A) All tools used for engraving are etching tools as well.
(B) There are as many pin-tipped etching tools as there are bladed etching tools.
(C) No etching tool is both pin-tipped and bladed.
(D) The majority of bladed etching tools are not used for engraving.
(E) All etching tools that are not used for engraving are bladed.

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Re: All etching tools are either pin-tipped or bladed. While some bladed  [#permalink]

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New post 02 Dec 2018, 21:32
Akela wrote:
All etching tools are either pin-tipped or bladed. While some bladed etching tools are used for engraving, some are not. On the other hand, all pin-tipped etching tools are used for engraving. Thus, there are more etching tools that are used for engraving than there are etching tools that are not used for engraving.

The conclusion of the argument follows logically if which one of the following is assumed?

(A) All tools used for engraving are etching tools as well.
(B) There are as many pin-tipped etching tools as there are bladed etching tools.
(C) No etching tool is both pin-tipped and bladed.
(D) The majority of bladed etching tools are not used for engraving.
(E) All etching tools that are not used for engraving are bladed.


So there are two types of etching tools - pin typed or P and bladed or B.
Some B are used for etching tools, some are not .. NO specific numbers. It could be just 2-3 out of 100 or 40-50 out of 70, we do not know.
All P are used for etching tools. But HOW many P are there??

Conclusion..
More number of etching tools are used for engraving..

So all P and some B constitute the majority...
But what if p is 10 and B is 100, and some B could be just 20 out of 100..
So 30 out of 110 is not majority..
Therefore P has to be atleast as much as B..

Exactly what choice B tells us..

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Re: All etching tools are either pin-tipped or bladed. While some bladed  [#permalink]

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New post 02 Feb 2019, 06:25
All etching tools are either pin-tipped or bladed. While some bladed etching tools are used for engraving, some are not. On the other hand, all pin-tipped etching tools are used for engraving. Thus, there are more etching tools that are used for engraving than there are etching tools that are not used for engraving.


Type-assumption
Core- etching tools(ET) that are used for engraving > etching tools(ET) that are not used for engraving
=> ET(Engraving) > ET(Non-Engraving)
=> Pin-tipped + Blade Engraved > Blade Non-Engraved

(B) There are as many pin-tipped etching tools as there are bladed etching tools. - Correct; If the total number of pin-tipped etching tools is equal to the total number of bladed etching tools, but at least one of those bladed etching tools is used for engraving, then our conclusion is valid
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Re: All etching tools are either pin-tipped or bladed. While some bladed  [#permalink]

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New post 03 Feb 2019, 02:16
Hey , I don't get it.. Can you eliminate answer choice E ., how B could be the answer, considering
All Etching tools = ET = 100
Bladed et 70, Pink point et = 30 ,
Some bladed et can do engraving = 60 some don't = 10
Still et for engraving ( 60+ 30) are greater than not engraving et.

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Re: All etching tools are either pin-tipped or bladed. While some bladed  [#permalink]

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New post 03 Feb 2019, 04:52
rajatvermaenator wrote:
Hey , I don't get it.. Can you eliminate answer choice E ., how B could be the answer, considering
All Etching tools = ET = 100
Bladed et 70, Pink point et = 30 ,
Some bladed et can do engraving = 60 some don't = 10
Still et for engraving ( 60+ 30) are greater than not engraving et.

Posted from my mobile device


Hey,happy to help.
Assumption is something which is not mentioned in the question. So far so good.
The question states that all P can be used for engraving. Some B also but some B cannot.
Now looking at option E, all tools that cannot be used for engraving must be B type. It's exactly what's mentioned in the question. Hence it cannot be an assumption n hence it's a wrong option.
Correct answer choice B.

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Re: All etching tools are either pin-tipped or bladed. While some bladed  [#permalink]

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New post 31 Mar 2019, 22:39
Quote:
All etching tools are either pin-tipped or bladed. While some bladed etching tools are used for engraving, some are not. On the other hand, all pin-tipped etching tools are used for engraving. Thus, there are more etching tools that are used for engraving than there are etching tools that are not used for engraving.


A Tree diagram would help in better visualization.

Etching Tools(Assume 100)--------- Pin Tipped (Say 40)------ Used for engraving (40)
------- Not engraving (0)

---------Bladed (Say 60)------------Used for engraving (1- assuming minimum value)
------------Not engraving (59)

Total no. of etching tools not used for engraving = 59
Total no. of tools used for engraving = 41

Conclusion: There are more etching tools that are used for engraving than there are etching tools that are not used for engraving.

In, our case the conclusion wont stand. So, for the conclusion to stand, rework the example

Etching Tools(Assume 100)--------- Pin Tipped (Say 50)------ Used for engraving (50)
------- Not engraving (0)

---------Bladed (Say 50)------------Used for engraving (1- assuming minimum value)
------------Not engraving (49)

Total no. of etching tools not used for engraving = 49
Total no. of tools used for engraving = 51

Therefore, in this case there are more etching tools that are used for engraving than there are etching tools that are not used for engraving.

So, the author assumed Pin tipped tools to be greater than or equal to Bladed tools.

Quote:
The conclusion of the argument follows logically if which one of the following is assumed?


Quote:
(A) All tools used for engraving are etching tools as well.


All tools whether used for engraving or not engraving are essentially etching tools. No new information there.

Quote:
(B) There are as many pin-tipped etching tools as there are bladed etching tools.


This is according to assumption.

Quote:
(C) No etching tool is both pin-tipped and bladed.


The argument says etching tools are either pin tipped or bladed. So, that means an etching tool cannot be both pin tipped and bladed. So, new information here.


Quote:
(D) The majority of bladed etching tools are not used for engraving.


Does'nt help with the conclusion if you take majority or just 1.

Quote:
(E) All etching tools that are not used for engraving are bladed.


May be. May be not. But will not help us with the conclusion.
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Re: All etching tools are either pin-tipped or bladed. While some bladed   [#permalink] 31 Mar 2019, 22:39
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