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Africa's black rhino population in the mid-1970's numbered about 20,00

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Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 25 Jun 2007, 23:39
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A
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Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.

(A) the estimated population
(B) that of their estimated population
(C) more than the population's estimated amount
(D) more black rhinos than their population estimate
(E) more than that of their population's estimated amount
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post Updated on: 31 Aug 2018, 23:04
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The easiest way to tackle this is to disregard the plural pronoun ‘their’, which has no place in this context since we are talking of the population of the rhino (a singular). Therefore, B and E are gone. We do not calculate a population in terms of ‘amount’. Therefore, C is gone. In D, the population estimate is weird. The estimated population is the acceptable version. A is the correct choice
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Originally posted by daagh on 22 Jul 2012, 19:18.
Last edited by daagh on 31 Aug 2018, 23:04, edited 1 time in total.
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 21 Jul 2012, 13:26
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You are comparing rhino population in the mid-1970's and the estimated population 1997 here.Now when you say "that of their estimated population, "that" must refer to something which is worth comparing with the past population.As you can find out that there is no such antecedent, "that" is unfit here
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 31 May 2011, 12:46
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misterJJ2u wrote:
Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.

(b) that of their estimated population
(c) more than the population's estimated amount
(d) more black rhinos than their population estimate
(e) more than that of their population's estimated amount

Please provide explanations why each answer should be ruled out.


"more than" redundant.
their- pronoun doesn't agree in number.

A best.
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 31 May 2011, 22:32
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we can count rhinos so 'amount' does not seem appropriate, hence c and e are out.
d is wordy, and using 'that' in B is wrong. Hence A.

But, i wonder if there is any thing like 'ten times less' ....
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 21 Jul 2012, 13:33
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gmatcallow wrote:
You are comparing rhino population in the mid-1970's and the estimated population 1997 here.Now when you say "that of their estimated population, "that" must refer to something which is worth comparing with the past population.As you can find out that there is no such antecedent, "that" is unfit here



is it because the population of 1997 is already mentioned here, that the use THAT is redundant?

had it been something like this

Africa's black rhino population in the mid-1970's numbered about 20,000, ten times THAT of 1997.

would it be correct?
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 21 Jul 2012, 13:44
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Perfect :)

Try to fit this concept here.

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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 10 Jun 2013, 08:50
THE Main problem with D is that
"ten time more than" mean 11 times the population. This is not logic.

"ten time as many as" mean 10 times

is my thinking correct?
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 10 Jun 2013, 09:08
vietmoi999 wrote:
THE Main problem with D is that
"ten time more than" mean 11 times the population. This is not logic.

"ten time as many as" mean 10 times

is my thinking correct?


So you would think!! But surprisingly, I have seen Official questions, where such "mathematical anomalies" are considered acceptable in the correct answer.

D is primarily more verbose than the correct answer A.
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 30 Jan 2014, 23:53
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(a) the estimated population--- a quantity compared with another quantity: correct comparison and correct choice.
(b) that of their estimated population ---- The problem is the plural pronoun ‘their’; there is no justification for using a plural
(c) more than the population's estimated amount ---- ‘ten times as x means 10x; ten times ‘more than x’ means 11 x
(d) more black rhinos than their population estimate--- same as C ; in addition the problematic ‘their’
(e) more than that of their population's estimated amount --- same as that of D.
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 01 Mar 2017, 18:22
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Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.

(a) the estimated population
This version is not perfect, in that "20,000, ten times the estimated population of 2000" is a little awkward and does not make complete sense, but basically it logically compares 20,000 with 2000.

(b) that of their estimated population
This choice has two issues. First there is no logical antecedent for "that". Ten times what of the estimated population? Second, though there are multiple black rhinos in the population of black rhinos, in the sentence itself, there is no logical antecedent for "their".

(c) more than the population's estimated amount
"ten times more" is not logical. The point is that 20,000 is ten times 2,000. "ten times more", if it means anything, means eleven times, and eleven times 2000 is 22,000, not 20,000. "amount" does not correctly refer to a countable number. Also, "the population's estimated amount of 2,000" is awkward and does not clearly convey that the number of rhinos in the population was 2,000.

(d) more black rhinos than their population estimate
This version repeats the "ten times more than" error seen in C, and "their" has no logical antecedent. Also, this version illogically compares "black rhinos" to "their population estimate of 2000".

(e) more than that of their population's estimated amount
This version repeats the "ten times more than" flaw and the "amount" error seen in C. "that" is unnecessary and has no logical antecedent. "their" has no logical antecedent. The entire choice is unnecessarily wordy and does not directly compare 20,000 with 2,000, but rather compares 20,000 with "that of ... 2,000", a comparison that conveys nothing that makes sense.

The best answer is A.
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 30 Jun 2017, 21:39
Hi egmat

Bit confused while applying comparison here.
Initial no: In 1997, 2000
Mid 1970: 20,000 (10 times of 2000)

More than phrase in C,D and E suggests value more than 20,000 in mid 1970s which is incorrect.

For (B) does that jump over noun ten times and
noun phrase in the mid-1970's numbered about 20,000, to suggest illogical
comparison between rhino population and esteemed population.

WR,
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 27 Mar 2018, 08:59
daagh wrote:
(a) the estimated population--- a quantity compared with another quantity: correct comparison and correct choice.
(b) that of their estimated population ---- The problem is the plural pronoun ‘their’; there is no justification for using a plural
(c) more than the population's estimated amount ---- ‘ten times as x means 10x; ten times ‘more than x’ means 11 x
(d) more black rhinos than their population estimate--- same as C ; in addition the problematic ‘their’
(e) more than that of their population's estimated amount --- same as that of D.


daagh GMATNinja
Can we eliminate options B and D on the basis of the pronoun that ?
"that" takes a singular noun(population). So the sentence looks like
"Africa's black rhino population in the mid-1970's numbered about 20,000, ten times population of their estimated population of 2,000 in 1997."
Is this a correct approach?
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 27 Mar 2018, 09:46
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itisSheldon wrote:
daagh wrote:
(a) the estimated population--- a quantity compared with another quantity: correct comparison and correct choice.
(b) that of their estimated population ---- The problem is the plural pronoun ‘their’; there is no justification for using a plural
(c) more than the population's estimated amount ---- ‘ten times as x means 10x; ten times ‘more than x’ means 11 x
(d) more black rhinos than their population estimate--- same as C ; in addition the problematic ‘their’
(e) more than that of their population's estimated amount --- same as that of D.


daagh GMATNinja
Can we eliminate options B and D on the basis of the pronoun that ?
"that" takes a singular noun(population). So the sentence looks like
"Africa's black rhino population in the mid-1970's numbered about 20,000, ten times population of their estimated population of 2,000 in 1997."
Is this a correct approach?

Yup, that's exactly how I would think of it. The only singular noun "that" could possibly refer back to is the population. So for (B), we get "...ten times the population of their estimated population", exactly as you said. For (E), we get "...ten times more than the population of their population's estimated amount." Both are pretty ridiculous. (And "their" is a problem in both of those too, for whatever it's worth.)

The GMAT seems to love using "that" as a pronoun for some reason, so I promise that you'll see this again. :-)
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 14 May 2018, 01:37
GMATNinja Could you please help with my query for pronoun ambiguity. As of now, in reference to GMAT, I feel that Possessive pronoun can refer possessive noun. So, if my understanding is correct, then please tell me whether "their"in this SC problem can refer "Black Rhinos' ".

GMATNinja wrote:
itisSheldon wrote:
daagh wrote:
(a) the estimated population--- a quantity compared with another quantity: correct comparison and correct choice.
(b) that of their estimated population ---- The problem is the plural pronoun ‘their’; there is no justification for using a plural
(c) more than the population's estimated amount ---- ‘ten times as x means 10x; ten times ‘more than x’ means 11 x
(d) more black rhinos than their population estimate--- same as C ; in addition the problematic ‘their’
(e) more than that of their population's estimated amount --- same as that of D.


daagh GMATNinja
Can we eliminate options B and D on the basis of the pronoun that ?
"that" takes a singular noun(population). So the sentence looks like
"Africa's black rhino population in the mid-1970's numbered about 20,000, ten times population of their estimated population of 2,000 in 1997."
Is this a correct approach?

Yup, that's exactly how I would think of it. The only singular noun "that" could possibly refer back to is the population. So for (B), we get "...ten times the population of their estimated population", exactly as you said. For (E), we get "...ten times more than the population of their population's estimated amount." Both are pretty ridiculous. (And "their" is a problem in both of those too, for whatever it's worth.)

The GMAT seems to love using "that" as a pronoun for some reason, so I promise that you'll see this again. :-)
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 14 May 2018, 19:24
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gmatacer40 wrote:
GMATNinja Could you please help with my query for pronoun ambiguity. As of now, in reference to GMAT, I feel that Possessive pronoun can refer possessive noun. So, if my understanding is correct, then please tell me whether "their"in this SC problem can refer "Black Rhinos' ".


Quote:
Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.

(A) the estimated population
(B) that of their estimated population
(C) more than the population's estimated amount
(D) more black rhinos than their population estimate
(E) more than that of their population's estimated amount


In (B) and (E), there's absolute no chance that "their" could refer to "black rhinos". Why? The phrase "black rhinos" doesn't actually appear in either of those answer choices. We have "Africa's black rhino population" in the non-underlined portion, and that's unambiguously singular. The sentence says "Africa's black rhino population", not "the black rhinos' population". So "their" is wrong in both (B) and (E).

In (D), "their" actually HAS to refer to "black rhinos", since it's the only plural noun that appears earlier in the sentence. But that still doesn't make sense: "Africa's black rhino population in the mid-1970's numbered about 20,000, ten times more black rhinos than [the black rhinos'] population estimate." It's pretty messy and illogical to compare the number of black rhinos to "the black rhinos' population estimate." It's also weird to suggest that the rhinos somehow "possess" a population estimate.

I hope this helps!
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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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New post 14 Jan 2019, 21:04
adkikani wrote:
Hi egmat

Bit confused while applying comparison here.
Initial no: In 1997, 2000
Mid 1970: 20,000 (10 times of 2000)

More than phrase in C,D and E suggests value more than 20,000 in mid 1970s which is incorrect.

For (B) does that jump over noun ten times and
noun phrase in the mid-1970's numbered about 20,000, to suggest illogical
comparison between rhino population and esteemed population.

WR,
Arpit.


Hi Arpit,
Here in B that is used as a pronoun. When that is used as a pronoun it creates a new copy of what it is used for.
For eg: Like the poetry of Bruce Willis, that of Chuck Norris is flowery and pretty
above sentence can also be written as:
Like the poetry of Bruce Willis, the poetry of Chuck Norris is flowery and pretty.

Now getting back to this question. Here we do not need a copy as the estimated population is already part of the answer choice B. So that is not pointing to anything. Hence incorrect.

I hope it helps.

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Re: Africa's black rhino population in the mid-1970's numbered about 20,00  [#permalink]

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Re: Africa's black rhino population in the mid-1970's numbered about 20,00   [#permalink] 10 Dec 2019, 09:03
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