GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 21 Aug 2019, 04:54

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Numismatist: In medieval Spain, most gold coins were minted from gold

Author Message
TAGS:

### Hide Tags

CR & LSAT Forum Moderator
Status: He came. He saw. He conquered. -- Studying for the LSAT -- Corruptus in Extremis
Joined: 31 Jul 2017
Posts: 716
Location: United States (MA)
Concentration: Finance, Economics
Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

05 Jun 2019, 13:12
2
3
00:00

Difficulty:

95% (hard)

Question Stats:

50% (02:43) correct 50% (02:38) wrong based on 261 sessions

### HideShow timer Statistics

Numismatist: In medieval Spain, most gold coins were minted from gold mined in West Africa, in the area that is now Senegal. The gold mined in this region was the purest known. Its gold content of 92 percent allowed coins to be minted without refining the gold, and indeed coins minted from this source of gold can be recognized because they have that gold content. The mints could refine gold and produced other kinds of coins that had much purer gold content, but the Senegalese gold was never refined.

Which one of the following inferences about gold coins minted in medieval Spain is most strongly supported by the information the numismatist gives?

(A) Coins minted from Senegalese gold all contained the same weight, as well as the same proportion of gold
(B) The source of some refined gold from which coins were minted was unrefined gold with a gold content of less than 92 percent
(C) Two coins could have the same monetary value even though they differed from each other in the percentage of gold they contained
(D) No gold coins were minted that had a gold content of less than 92 percent
(E) The only unrefined gold from which coins could be minted was Senegalese gold

_________________
D-Day: November 18th, 2017

Want to be a moderator? We may want you to be one! See how here: https://gmatclub.com/forum/gmat-club-moderators-directory-253455.html

Need a laugh and a break? Go here: https://gmatclub.com/forum/mental-break-funny-videos-270269.html

Need a CR tutor? PM me!
Intern
Joined: 30 May 2019
Posts: 1
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

05 Jun 2019, 18:01
(A)Weight of coins is out of scope.'All' is an extreme word because CR talks about most gold coins and not all gold coins.

(B) Ans . If most coins were minted from Senegal , then some were from different source which has less purity of gold.

(D) 'No'is an extreme word.

(E) 'Only' is an extreme word.

Posted from my mobile device
Manager
Joined: 18 Aug 2017
Posts: 86
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

09 Jul 2019, 08:31
Hi swirlsky,

Based on your explanation, in choice B, so we need to assume that
the less the purity of gold, the less percentage of gold content?

And if so, can we assume that to correctly infer?

Thank you.
Manager
Joined: 17 Aug 2018
Posts: 113
GMAT 1: 610 Q43 V31
GMAT 2: 640 Q45 V32
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

10 Jul 2019, 17:27
I don't get why B is better than E. The prompt says that Senegalese gold was never refined for coin production, and this is answer choice E.
Veritas Prep GMAT Instructor
Joined: 01 May 2019
Posts: 50
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

11 Jul 2019, 08:00
1
mykrasovski wrote:
I don't get why B is better than E. The prompt says that Senegalese gold was never refined for coin production, and this is answer choice E.

If answer choice E said that Senegalese gold was never refined for coin production, it would be a valid inference ... but that isn't what answer choice E says. E doesn't say that Senegalese gold was never refined for coin production; it says that non-Senegalese gold was always refined for coin production. This can't be found anywhere in the passage. It's distinctly possible that other gold (although somewhat less pure than Senegalese gold) could still be used to mint coins — maybe a gold content of 90 or 91% would still be pure enough not to need refining. We just don't know, so E doesn't have to be true.

Correct answers for Inference questions (like this one) must be 100% true given the information in the passage, so it's extremely important to read the answer choices carefully. If we misread or make assumptions about what the answer choices say, we're likely to miss the question.
Manager
Joined: 17 Aug 2018
Posts: 113
GMAT 1: 610 Q43 V31
GMAT 2: 640 Q45 V32
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

11 Jul 2019, 08:41
VeritasPrepErika wrote:
mykrasovski wrote:
I don't get why B is better than E. The prompt says that Senegalese gold was never refined for coin production, and this is answer choice E.

If answer choice E said that Senegalese gold was never refined for coin production, it would be a valid inference ... but that isn't what answer choice E says. E doesn't say that Senegalese gold was never refined for coin production; it says that non-Senegalese gold was always refined for coin production. This can't be found anywhere in the passage. It's distinctly possible that other gold (although somewhat less pure than Senegalese gold) could still be used to mint coins — maybe a gold content of 90 or 91% would still be pure enough not to need refining. We just don't know, so E doesn't have to be true.

Correct answers for Inference questions (like this one) must be 100% true given the information in the passage, so it's extremely important to read the answer choices carefully. If we misread or make assumptions about what the answer choices say, we're likely to miss the question.

Hi Erika, thanks much for addressing my question. After reading the prompt today and thinking very thoroughly, I totally understand why E is not a good option. The passage says that "most gold coins were minted from Senegalese gold which had high quality", and one can conclude that there could possibly be other sources of gold and there are no data about the quality of the gold from those hypothetical regions. So, it is possible that there was a region (or even a few) which had high quality gold that did not have to be refined, i.e. it was comparable to gold from Senegal. So, E could be true but does not necessarily have to be true. Is my reasoning correct?

I also realized that E is overly strong because of "the only" language. Generally, strong statements tend to be good answer choices for Weaken / Strengthen questions, but not for Assumption & Inference questions. So, one at least should be suspicious about option E in this particular question. Would you generally agree with my observations?
Veritas Prep GMAT Instructor
Joined: 01 May 2019
Posts: 50
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

11 Jul 2019, 08:48
1
mykrasovski wrote:
VeritasPrepErika wrote:
mykrasovski wrote:
I don't get why B is better than E. The prompt says that Senegalese gold was never refined for coin production, and this is answer choice E.

If answer choice E said that Senegalese gold was never refined for coin production, it would be a valid inference ... but that isn't what answer choice E says. E doesn't say that Senegalese gold was never refined for coin production; it says that non-Senegalese gold was always refined for coin production. This can't be found anywhere in the passage. It's distinctly possible that other gold (although somewhat less pure than Senegalese gold) could still be used to mint coins — maybe a gold content of 90 or 91% would still be pure enough not to need refining. We just don't know, so E doesn't have to be true.

Correct answers for Inference questions (like this one) must be 100% true given the information in the passage, so it's extremely important to read the answer choices carefully. If we misread or make assumptions about what the answer choices say, we're likely to miss the question.

Hi Erika, thanks much for addressing my question. After reading the prompt today and thinking very thoroughly, I totally understand why E is not a good option. The passage says that "most gold coins were minted from Senegalese gold which had high quality", and one can conclude that there could possibly be other sources of gold and there are no data about the quality of the gold from those hypothetical regions. So, it is possible that there was a region (or even a few) which had high quality gold that did not have to be refined, i.e. it was comparable to gold from Senegal. So, E could be true but does not necessarily have to be true. Is my reasoning correct?

I also realized that E is overly strong because of "the only" language. Generally, strong statements tend to be good answer choices for Weaken / Strengthen questions, but not for Assumption & Inference questions. So, one at least should be suspicious about option E in this particular question. Would you generally agree with my observations?

Solid reasoning! I also like that you're looking out for extreme language — and "only" is a really classic example. Should we rule an answer out immediately because of extreme language? No. Sometimes extreme things are true. But we shouldn't give it any more attention until we've ruled out less extreme, more plausible answer choices. This will save us from wasting time and mental energy on wrong answer choices and accidentally convincing ourselves of something that isn't likely to be true.
Intern
Status: As cheeks from my insta feed say: soon...
Joined: 17 Jan 2016
Posts: 40
Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

07 Aug 2019, 23:00
Numismatist: In medieval Spain, most gold coins were minted from gold mined in West Africa, in the area that is now Senegal. The gold mined in this region was the purest known. Its gold content of 92 percent allowed coins to be minted without refining the gold, and indeed coins minted from this source of gold can be recognized because they have that gold content. The mints could refine gold and produced other kinds of coins that had much purer gold content, but the Senegalese gold was never refined.

Which one of the following inferences about gold coins minted in medieval Spain is most strongly supported by the information the numismatist gives?

(A) Coins minted from Senegalese gold all contained the same weight, as well as the same proportion of gold
(B) The source of some refined gold from which coins were minted was unrefined gold with a gold content of less than 92 percent
(C) Two coins could have the same monetary value even though they differed from each other in the percentage of gold they contained
(D) No gold coins were minted that had a gold content of less than 92 percent
(E) The only unrefined gold from which coins could be minted was Senegalese gold

Hello everyone,

I rejected B because most can mean all as well (I learned this in e-gmat, though I still don't understand why), and the last sentence says the mints COULD refine and produce OTHER KINDS OF COINS (it doesn't say they did refine)

Can anyone make all the staff above clear for me?
Manager
Joined: 19 Sep 2017
Posts: 179
Location: United Kingdom
GPA: 3.9
WE: Account Management (Other)
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

07 Aug 2019, 23:38
Hi nurba92 ,
Most is >50% but <100%.
Having said that, most, but not all, coins in medieval Spain were made from gold mined from Senegal. That means, there was still some % of coins made from gold that was not from Senegal, irrespective of what gold content they had.
Now, lets look at the choices.
A is easy to reject as weight of a coin is not mentioned in the argument.
B does align with our argument. Keep it as a contender for now.
C talks about value of two different coins. Again, it’s not mentioned anywhere in the given argument. Incorrect.
D Whether or not gold coins were minted if the gold content was less than 92% is not given in the argument. We could only say certain thing about MOST of the coins, such as good content in those that were minted from Senegalese gold. Nothing more than that. incorrect.
E Now, making such a statement that Senegalese gold was the ONLY gold that did not need any refining is a strong statement and we cannot make such a statement unless it is given that no other gold had such purity level as Senegalese that it did not need to be refined.
So, B is the only statement that has a proof of being 100% correct.
Hence, B is the winner.
Hope this helps.

Posted from my mobile device
_________________
Cheers!!

~Whatever one practices, becomes a habit. Make sure you practice the right ones.~
Intern
Status: As cheeks from my insta feed say: soon...
Joined: 17 Jan 2016
Posts: 40
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

07 Aug 2019, 23:45
Doer01 wrote:
Hi nurba92 ,
Most is >50% but <100%.
Having said that, most, but not all, coins in medieval Spain were made from gold mined from Senegal.

Posted from my mobile device

Doer01,
In the stimulus, there is no mention of "not all". And as I said, I still don't understand why most can mean all, but e-gmat says so (since they are way more experienced, I memorized this staff)
Can you tell me is there any way how we can infer "all" from "most" or it is totally incorrect?
Thanks
Manager
Joined: 19 Sep 2017
Posts: 179
Location: United Kingdom
GPA: 3.9
WE: Account Management (Other)
Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

08 Aug 2019, 01:13
nurba92 wrote:
Doer01 wrote:
Hi nurba92 ,
Most is >50% but <100%.
Having said that, most, but not all, coins in medieval Spain were made from gold mined from Senegal.

Posted from my mobile device

Doer01,
In the stimulus, there is no mention of "not all". And as I said, I still don't understand why most can mean all, but e-gmat says so (since they are way more experienced, I memorized this staff)
Can you tell me is there any way how we can infer "all" from "most" or it is totally incorrect?
Thanks

Hi nurba92,
"but not all" is something that could be inferred when "most" is used. That's why I had put inside a comma pair.
Second, Most cannot mean all as both are different quantity markers according to CR Bible. I took e-gmat course too and I do not remember most being translated to all.
_________________
Cheers!!

~Whatever one practices, becomes a habit. Make sure you practice the right ones.~
Intern
Status: As cheeks from my insta feed say: soon...
Joined: 17 Jan 2016
Posts: 40
Re: Numismatist: In medieval Spain, most gold coins were minted from gold  [#permalink]

### Show Tags

08 Aug 2019, 22:17
Numismatist: In medieval Spain, most gold coins were minted from gold mined in West Africa, in the area that is now Senegal. The gold mined in this region was the purest known. Its gold content of 92 percent allowed coins to be minted without refining the gold, and indeed coins minted from this source of gold can be recognized because they have that gold content. The mints could refine gold and produced other kinds of coins that had much purer gold content, but the Senegalese gold was never refined.

Which one of the following inferences about gold coins minted in medieval Spain is most strongly supported by the information the numismatist gives?

(A) Coins minted from Senegalese gold all contained the same weight, as well as the same proportion of gold
(B) The source of some refined gold from which coins were minted was unrefined gold with a gold content of less than 92 percent
(C) Two coins could have the same monetary value even though they differed from each other in the percentage of gold they contained
(D) No gold coins were minted that had a gold content of less than 92 percent
(E) The only unrefined gold from which coins could be minted was Senegalese gold

Guys,
If most means 51-99%, its logical opposite is 50% or less, but what about 100% in this very case? (I don't mean 100% is all staff, I mean that when considering "most", 100% is absent both in itself and in its logical opposite)
Thanks
Re: Numismatist: In medieval Spain, most gold coins were minted from gold   [#permalink] 08 Aug 2019, 22:17
Display posts from previous: Sort by