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In 1980, 13% of the Arbican population moved from urban area

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In 1980, 13% of the Arbican population moved from urban area  [#permalink]

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New post 13 Oct 2013, 21:54
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A
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E

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Question Stats:

67% (02:03) correct 33% (02:05) wrong based on 441 sessions

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In 1980, 13% of the Arbican population moved from urban areas to suburban areas. This percentage steadily declined, until, in 1990, it reached 3%.

If the statements above are true, all of the following statements concerning Arbicans between 1980 and 1990 could also be true EXCEPT:

A. The number of Arbicans moving from suburban areas to urban areas also decreased.
B. The Arbican population increased, and so did the number of Arbicans moving from urban to suburban areas.
C. The Arbican population decreased, and so did the number of Arbicans moving from urban to suburban areas.
D. The Arbican population decreased, and the number of Arbicans moving from urban to suburban areas remained the same.
E. The Arbican population increased, and the number of Arbicans moving from urban to suburban areas remained the same.

Nice one !!
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Re: In 1980, 13% of the Arbican population moved from urban area  [#permalink]

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New post 21 Nov 2014, 04:06
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In 1980, 13% of the Arbican population moved from urban areas to suburban areas. This percentage steadily declined, until, in 1990, it reached 3%.

If the statements above are true, all of the following statements concerning Arbicans between 1980 and 1990 could also be true EXCEPT:

A. The number of Arbicans moving from suburban areas to urban areas also decreased - Might be true
In 1980: 100 people; 13 moved (13%)
In 1990: Population remain same; 03 moved (3%)

B. The Arbican population increased, and so did the number of Arbicans moving from urban to suburban areas - Might be true
In 1980: 100 people; 13 moved (13%)
In 1990: 1000 people; 30 moved (3%)

C. The Arbican population decreased, and so did the number of Arbicans moving from urban to suburban areas - Might be true
In 1980: 200 people; 26 moved (13%)
In 1990: 100 people; 03 moved (3%)


D. The Arbican population decreased, and the number of Arbicans moving from urban to suburban areas remained the same - Can not be true
In 1980: 100 people; 26 moved (13%)
In 1990: say 99 people; slight <3 moved (3%)
Therefore if total pop decrease then number of people moving will also decrease to maintain the %age of exodus.


E. The Arbican population increased, and the number of Arbicans moving from urban to suburban areas remained the same - Might be true
In 1980: 200 people; 26 moved (13%)
In 1990: 900 people; 26 moved (3%)


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Re: In 1980, 13% of the Arbican population moved from urban area  [#permalink]

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New post 14 Oct 2013, 00:57
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This question can be solved by using numbers. Also notice the question steam used words such as Could be and EXCEPT.

A. The number of Arbicans moving from suburban areas to urban areas also decreased.----- Incorrect because this could be true. The question does not provide any information so we can infer that there is a chance of this trend to be true.
B. The Arbican population increased, and so did the number of Arbicans moving from urban to suburban areas.
Initial population in 1980-100, that mean 13 moved from UA to SA. If the population increased to 1000 in 1990, then 30 moved from UA to SA. INCORRECT.
C. The Arbican population decreased, and so did the number of Arbicans moving from urban to suburban areas.
Initial population in 1980-100, that means 13 moved from UA to SA. If the population decreased to 10 in 1990, then 3 moved from UA to SA. INCORRECT
D. The Arbican population decreased, and the number of Arbicans moving from urban to suburban areas remained the same. CORRECT.
E. The Arbican population increased, and the number of Arbicans moving from urban to suburban areas remained the same
If the population in 1980-300, that means 39 moved from UA to SA. If the population increased to 1300, then 39 moved from UA to SA. 13% of 300 and 3% of 1300 is the same. INCORRECT.
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Re: In 1980, 13% of the Arbican population moved from urban area  [#permalink]

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New post 14 Oct 2013, 02:34
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Nice Kudos to you :-) .. But perhaps approaching by POE and then comparing it between D & E with stats would help arrive at the solution much quickly.

akashb106 wrote:
This question can be solved by using numbers. Also notice the question steam used words such as Could be and EXCEPT.

A. The number of Arbicans moving from suburban areas to urban areas also decreased.----- Incorrect because this could be true. The question does not provide any information so we can infer that there is a chance of this trend to be true.
B. The Arbican population increased, and so did the number of Arbicans moving from urban to suburban areas.
Initial population in 1980-100, that mean 13 moved from UA to SA. If the population increased to 1000 in 1990, then 30 moved from UA to SA. INCORRECT.
C. The Arbican population decreased, and so did the number of Arbicans moving from urban to suburban areas.
Initial population in 1980-100, that means 13 moved from UA to SA. If the population decreased to 10 in 1990, then 3 moved from UA to SA. INCORRECT
D. The Arbican population decreased, and the number of Arbicans moving from urban to suburban areas remained the same. CORRECT.
E. The Arbican population increased, and the number of Arbicans moving from urban to suburban areas remained the same
If the population in 1980-300, that means 39 moved from UA to SA. If the population increased to 1300, then 39 moved from UA to SA. 13% of 300 and 3% of 1300 is the same. INCORRECT.
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Re: In 1980, 13% of the Arbican population moved from urban area  [#permalink]

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New post 20 Nov 2014, 07:07
Toughie this. Very mathematical. Took some time. Any quick ways? POE?
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Re: In 1980, 13% of the Arbican population moved from urban area  [#permalink]

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New post 04 Sep 2016, 05:35
My 2 cents regarding this question. Since the % decreased steadily, we need to find something which justifies the case:

Although I was baffled between A & D, the question stem states that which of the following "could be true". Since D fits the bill perfectly had to choose D.


A. The number of Arbicans moving from suburban areas to urban areas also decreased. --- Nothing from the question stem can infer this statement but it could be true.
B. The Arbican population increased, and so did the number of Arbicans moving from urban to suburban areas. -- The number of people moving might have increased but compared to current population, it can be lower % leading to statement that movement % decreased.
C. The Arbican population decreased, and so did the number of Arbicans moving from urban to suburban areas. -- Justifies all statements under question stem
D. The Arbican population decreased, and the number of Arbicans moving from urban to suburban areas remained the same. -- if population decreased and no of people moving remained the same, then it should represent a greater % and not declining %.
E. The Arbican population increased, and the number of Arbicans moving from urban to suburban areas remained the same. -- Justifies all statements under question stem
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Re: In 1980, 13% of the Arbican population moved from urban area  [#permalink]

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New post 30 May 2019, 06:54
KAPLAN OFFICIAL EXPLANATION

Conclusion: We need to find the answer choice that is not possible, something that could not be true based on the evidence. This means the four wrong answers will be possible based on the evidence.

Evidence: 13% of Arbicans moved from urban to suburban areas in 1980, and this percentage fell steadily until it was down to 3% in 1990.

We are not given any information about the number or percentage of Arbicans moving from suburban to urban areas, so (A) definitely could be true. That the population increased, along with the number moving, (B), is also possible. The population and the number moving decreasing (C), is fine. And if the population is increasing while the number moving stays the same (E), the percentage would have to dip as we were told.

Answer choice (D) however, clearly contradicts the given information, since we know the percentage of Arbicans moving from urban to suburban areas has decreased, and if the population has also decreased, then the number of Arbicans moving from urban to suburban areas must also have decreased. So (D) is the correct answer.
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Re: In 1980, 13% of the Arbican population moved from urban area   [#permalink] 30 May 2019, 06:54
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