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# Although beavers can still be found throughout the western

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Although beavers can still be found throughout the western [#permalink]

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03 May 2012, 16:51
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Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beaver lured armies of European trappers into the Rocky Mountains region to slaughter them for their pelts.

A)their number has declined compared with
B)their numbers have declined compared with
C)their numbers have declined since
D) their numbers have declined in comparison to those of
E)the number of them declined since

Do not understand their justification behind their comparison logic.
[Reveal] Spoiler: OA

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Re: Although beavers can still be found [#permalink]

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03 May 2012, 17:03
2
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A)their number has declined compared with - wrong comparison
B)their numbers have declined compared with - wrong comparison
C)their numbers have declined since - Correct
D) their numbers have declined in comparison to those of - Grammatically right, but wordy
E)the number of them declined since - number of (means many) beavers decline?? wrong.

'Beavers number' can not be compared with '18th century'. So A and B are out.

FYI

To compare to is to point out or imply resemblances between objects regarded as essentially of a different order;
To compare with is mainly to point out differences between objects regarded as essentially of the same order.
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Re: Although beavers can still be found [#permalink]

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09 May 2012, 06:57
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Expert's post
Hi All,

Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beaver lured armies of European trappers into the Rocky Mountains region to slaughter them for their pelts.

Error Analysis:
1. The sentence presents illogical comparison. The number of beavers has been compared to the eighteenth century.

POE:

Choice A: their number has declined compared with: Incorrect for the reason stated above.

Choice B: their numbers have declined compared with: Incorrect as this choice repeats the same error of Choice A.

Choice C: their numbers have declined since: Correct. Use of “since” clearly conveys the intended meaning of the sentence.

Choice D: their numbers have declined in comparison to those of: Incorrect. “those of” stands for “numbers of”. This again leads to an illogical comparison.

Choice E: the number of them declined since: Incorrect. “the number of them” is not same as “their number”. This choice seems to suggest that beavers had some kind of number that started to decline.

Hope this helps.
Thanks.
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Re: Although beavers can still be found [#permalink]

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10 May 2012, 00:02
Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beaver lured armies of European trappers into the Rocky Mountains region to slaughter them for their pelts.

A)their number has declined compared with 'their number' doesn't sound right
B)their numbers have declined compared with wrong comparison
C)their numbers have declined since concise
D) their numbers have declined in comparison to those of wordy
E)the number of them declined since distorts meaning
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Re: Although beavers can still be found [#permalink]

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10 May 2012, 00:32
Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beaver lured armies of European trappers into the Rocky Mountains region to slaughter them for their pelts.

A)their number has declined compared with
B)their numbers have declined compared with
C)their numbers have declined since
D) their numbers have declined in comparison to those of
E)the number of them declined since

A & B - Wrong comparison ('number' compared with 18th century - illogical)
C - Grammatically correct
D - 'in comparison to' is used when we are comparing two unlike things, but here from the
context we can infer that comparison is between numbers.
E - no present perfect used. (have declined since - correct)

But one question:
What if we use 'with' in D, does it make sense?

their numbers have declined in comparison with those of
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Re: Although beavers can still be found [#permalink]

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19 May 2012, 08:49
I narrowed it down to C & D, but chose D ...
"C)their numbers have declined since" ... I thought a sentence with "since" should have "have been" so in the case I was expecting "have been declining"
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Re: Although beavers can still be found [#permalink]

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05 Aug 2012, 06:02
Hi Sharddha,

Why do you says that numbers of illogical in option D...what is wrong in the statement that the numbers have declined in comparison to the numbers of 18th century?

Regards,
Pavan

egmat wrote:
Hi All,

Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beaver lured armies of European trappers into the Rocky Mountains region to slaughter them for their pelts.

Error Analysis:
1. The sentence presents illogical comparison. The number of beavers has been compared to the eighteenth century.

POE:

Choice A: their number has declined compared with: Incorrect for the reason stated above.

Choice B: their numbers have declined compared with: Incorrect as this choice repeats the same error of Choice A.

Choice C: their numbers have declined since: Correct. Use of “since” clearly conveys the intended meaning of the sentence.

Choice D: their numbers have declined in comparison to those of: Incorrect. “those of” stands for “numbers of”. This again leads to an illogical comparison.

Choice E: the number of them declined since: Incorrect. “the number of them” is not same as “their number”. This choice seems to suggest that beavers had some kind of number that started to decline.

Hope this helps.
Thanks.
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Re: Although beavers can still be found [#permalink]

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05 Aug 2012, 09:18
A)their number has declined compared with
number can not be compared with time
B)their numbers have declined compared with
same as (A)
C)their numbers have declined since
CORRECT gives clarity in meaning
D) their numbers have declined in comparison to those of
time period doesn't have numbers to decline
E)the number of them declined since
them is improper pronoun here
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Re: Although beavers can still be found throughout the western [#permalink]

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17 Apr 2013, 01:24
Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beaver lured armies of European trappers into the Rocky Mountains region to slaughter them for their pelts.

A)their number has declined compared with
Wrong. Number vs the eighteenth century

B)their numbers have declined compared with
Wrong. Number vs the eighteenth century

C)their numbers have declined since
Correct. Present perfect tense.

D) their numbers have declined in comparison to those of
Wrong. Number vs the eighteenth century

E)the number of them declined since
Wrong. "The number of them" is incorrect
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Re: Although beavers can still be found throughout the western [#permalink]

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11 Feb 2014, 02:48
Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beaver lured armies of European trappers into the Rocky Mountains region to slaughter them for their pelts.

A)their number has declined compared with
Illogical comparison: beavers are compared with the eighteen century
B)their numbers have declined compared with
Same as A
C)their numbers have declined since
Hold
D) their numbers have declined in comparison to those of
This is disguised pretty well, we are comparing beavers with the numbers of eighteen century (literally 1800 the digits themselves) that's totally illogical
E)the number of them declined since
them is useless and wrong in this context.
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Re: Although beavers can still be found [#permalink]

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12 Mar 2014, 07:24

I do not understand how those of refers to numbers only and not 'numbers of beavers'.

Does D not mean the number of beavers have declined in comparison to the numbers of beavers in the 18th century

egmat wrote:
Choice D: their numbers have declined in comparison to those of: Incorrect. “those of” stands for “numbers of”. This again leads to an illogical comparison.

Hope this helps.
Thanks.
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Re: Although beavers can still be found throughout the western [#permalink]

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13 Mar 2014, 00:03
I think D should have been: ... in comparison to those in..

Because right now, it is: ... in comparison to those of..

So, even if "those" is interpreted as "numbers of beavers", then it would be interpreted as: "numbers of beavers of 18th century". But there is no such thing as "beavers of 18th century"; it should be: "beavers in 18th century".
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Re: Although beavers can still be found throughout the western [#permalink]

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Re: Although beavers can still be found throughout the western [#permalink]

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03 Feb 2016, 05:40
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I'm a bit worried about the word 'numbers'

Is their numbers grammatically correct?

Replacing Their with Beavers'

Beavers' number
Beavers' numbers?
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Re: Although beavers can still be found throughout the western [#permalink]

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03 Feb 2016, 05:56
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C) their numbers have declined since the eighteenth century
The time reference is the eighteenth century. During this long, period, can we expect their number to stay at one particular number?
The numbers are ever changing features. Hence, the plural 'their numbers' should be ok in the given context.
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Re: Although beavers can still be found throughout the western [#permalink]

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03 Feb 2016, 06:03
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Number doesn't remain the same. But we don't say numbers when referring to the number of a group.

For e.g; The number of cars.

The only place I can think numbers is

The numbers are misleading, as in a collection of numbers itself.

The number of students, the number of houses, etc.
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Re: Although beavers can still be found throughout the western [#permalink]

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03 Feb 2016, 06:18
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Could you please look into this link for some clarification by Ron on this point?

https://www.manhattanprep.com/gmat/foru ... 25414.html

This question which originated in 2012 must have been correct then. It is not that this reasoning is wrong but is not used by GMAT these days.
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Re: Although beavers can still be found throughout the western   [#permalink] 03 Feb 2016, 06:18
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