Over the last 10 years, there has been a dramatic increase : GMAT Critical Reasoning (CR)
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# Over the last 10 years, there has been a dramatic increase

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Over the last 10 years, there has been a dramatic increase [#permalink]

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26 Sep 2007, 05:49
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Over the last 10 years, there has been a dramatic increase in the number of people over the age of 65 living in this region. This is evident from the fact that during this time the average age of people living in this region has increased from approximately 52 to 57 years.

Which one of the following, if true, would most strengthen the argument?

a-The number of people in the region under the age of 18 has increased over the last 10 years.

b-The birth rate for the region decreased significantly over the last 10 years.

c-The total number of people living in the region has decreased over the last 10 years.

d-The number of people who moved into the region over the last 10 years is greater than the number of those who moved out.

e-The average age for people in the region is higher than that for people in the surrounding regions.
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Re: CR - average age [#permalink]

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26 Sep 2007, 06:25
gmatguy1 wrote:
Over the last 10 years, there has been a dramatic increase in the number of people over the age of 65 living in this region. This is evident from the fact that during this time the average age of people living in this region has increased from approximately 52 to 57 years.

Which one of the following, if true, would most strengthen the argument?

a-The number of people in the region under the age of 18 has increased over the last 10 years.

b-The birth rate for the region decreased significantly over the last 10 years.

c-The total number of people living in the region has decreased over the last 10 years.

d-The number of people who moved into the region over the last 10 years is greater than the number of those who moved out.

e-The average age for people in the region is higher than that for people in the surrounding regions.

answer A although D was a close contender

the stem is telling us that NUMBER of people over 65yo increased and supported the statement with stating that the AVERAGE went up (classic GMAT trap). The only two answer choices that would support that the number of people went up are A and D.

B - neutral
C - disproves the argument
E - out of scope

Between A and D, A supports that not only did the number of people go up, but in order for the average to go up (since more 18 yo's) the people over 65 must have gone up too in order for the overall average to increase. D just states that there are more people moving in but we dont know if they are people over 65.
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26 Sep 2007, 07:04
A...
good explanation beckee
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Re: CR - average age [#permalink]

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26 Sep 2007, 09:49
beckee529 wrote:
gmatguy1 wrote:
Over the last 10 years, there has been a dramatic increase in the number of people over the age of 65 living in this region. This is evident from the fact that during this time the average age of people living in this region has increased from approximately 52 to 57 years.

Which one of the following, if true, would most strengthen the argument?

a-The number of people in the region under the age of 18 has increased over the last 10 years.

b-The birth rate for the region decreased significantly over the last 10 years.

c-The total number of people living in the region has decreased over the last 10 years.

d-The number of people who moved into the region over the last 10 years is greater than the number of those who moved out.

e-The average age for people in the region is higher than that for people in the surrounding regions.

answer A although D was a close contender

the stem is telling us that NUMBER of people over 65yo increased and supported the statement with stating that the AVERAGE went up (classic GMAT trap). The only two answer choices that would support that the number of people went up are A and D.

B - neutral
C - disproves the argument
E - out of scope

Between A and D, A supports that not only did the number of people go up, but in order for the average to go up (since more 18 yo's) the people over 65 must have gone up too in order for the overall average to increase. D just states that there are more people moving in but we dont know if they are people over 65.

thats a very tricky CR. I guessed B b/c it seemed this would increase the average age if less babies were born.

Nice explanation. Never would have caught that.
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Re: CR - average age [#permalink]

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26 Sep 2007, 10:04
gmatguy1 wrote:
Over the last 10 years, there has been a dramatic increase in the number of people over the age of 65 living in this region. This is evident from the fact that during this time the average age of people living in this region has increased from approximately 52 to 57 years.

Which one of the following, if true, would most strengthen the argument?

a-The number of people in the region under the age of 18 has increased over the last 10 years.

b-The birth rate for the region decreased significantly over the last 10 years.

c-The total number of people living in the region has decreased over the last 10 years.

d-The number of people who moved into the region over the last 10 years is greater than the number of those who moved out.

e-The average age for people in the region is higher than that for people in the surrounding regions.

IMO it's B. In D we do not know what ages of those people who moved into the region were.
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26 Sep 2007, 11:35
C, D, E are out of scope.
B weakens the argument.

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26 Sep 2007, 11:50
Juaz wrote:
C, D, E are out of scope.
B weakens the argument.

Could you, please, elaborate on how B weakens the argument???
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26 Sep 2007, 11:58
Juaz wrote:
C, D, E are out of scope.
B weakens the argument.

Could you, please, elaborate on how B weakens the argument???

If birth rate decreased "significantly" it menas every ppl in town has contributed to increase in average age e.g. 20 year old is 30 year old, 30 yr old is 40 yr old.
As average age increased only by 5 years and not many new ppl were born, there might be increase in population of younger ppl to compensate average age.

B, if not weakens, doesn't help argument in any way.
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26 Sep 2007, 13:11
still not clear on this one. Can someone explain again.
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Re: CR - average age [#permalink]

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26 Sep 2007, 13:47
gmatguy1 wrote:
Over the last 10 years, there has been a dramatic increase in the number of people over the age of 65 living in this region. This is evident from the fact that during this time the average age of people living in this region has increased from approximately 52 to 57 years.

Which one of the following, if true, would most strengthen the argument?

a-The number of people in the region under the age of 18 has increased over the last 10 years.

b-The birth rate for the region decreased significantly over the last 10 years.

c-The total number of people living in the region has decreased over the last 10 years.

d-The number of people who moved into the region over the last 10 years is greater than the number of those who moved out.

e-The average age for people in the region is higher than that for people in the surrounding regions.

A.
If there are a lot more 18 years old, this should bring the average down. However, the average goes up. This means dramatic amount of old people must move in to bring the average up.
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26 Sep 2007, 14:00
Its time for OA gmatguy
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26 Sep 2007, 18:36
OA is A

thanks very much for all of your contributions.
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26 Sep 2007, 22:30
gmatguy1 wrote:
OA is A

thanks very much for all of your contributions.

If you have OE, please, post it
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26 Sep 2007, 22:40
Juaz wrote:
Juaz wrote:
C, D, E are out of scope.
B weakens the argument.

Could you, please, elaborate on how B weakens the argument???

If birth rate decreased "significantly" it menas every ppl in town has contributed to increase in average age e.g. 20 year old is 30 year old, 30 yr old is 40 yr old.
As average age increased only by 5 years and not many new ppl were born, there might be increase in population of younger ppl to compensate average age.

B, if not weakens, doesn't help argument in any way.

Consider the following situation:

We have 3 people of 2, 5, 10 years old => the average is 4 years old
If no people are born, in 5 years their ages will be 7, 10, 15 years old => the average is approximately 10,.. years old

In B it could be that along with the decrease in the birth rate, the mortality rate has increased => so OUT
In D we know nothing about the ages of those people =>OUT

Last edited by Vlad77 on 27 Sep 2007, 00:00, edited 1 time in total.
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26 Sep 2007, 23:53
A fits the bill. If more young people added to the population does not bring down the average age of the population, then it must be because there is also an increase in the number of old people living in the region.
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26 Sep 2007, 23:59
May be becuase those people under 18 years old moved with their parents (cause they are under 18 years old)???
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27 Sep 2007, 02:44
gmatguy1 wrote:
OA is A

thanks very much for all of your contributions.

If you have OE, please, post it

sorry, but i do not have the OE. the question is from an old lsat exam.
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Re: CR - average age [#permalink]

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27 Sep 2007, 08:38
gmatguy1 wrote:
Over the last 10 years, there has been a dramatic increase in the number of people over the age of 65 living in this region. This is evident from the fact that during this time the average age of people living in this region has increased from approximately 52 to 57 years.

Which one of the following, if true, would most strengthen the argument?

a-The number of people in the region under the age of 18 has increased over the last 10 years.

b-The birth rate for the region decreased significantly over the last 10 years.

c-The total number of people living in the region has decreased over the last 10 years.

d-The number of people who moved into the region over the last 10 years is greater than the number of those who moved out.

e-The average age for people in the region is higher than that for people in the surrounding regions.

I pick A.

If the number of people in the region under the age of 18 has increased over the last 10 years, and yet the avg. age has increased from 52-57 then we can safely conclude that there has been a dramatic increase in the number of people over the age of 65 living in this region.
Re: CR - average age   [#permalink] 27 Sep 2007, 08:38
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