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During a 10-week summer vacation, was the average

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Director
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Joined: 06 Jan 2008
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During a 10-week summer vacation, was the average [#permalink] New post 23 Apr 2008, 08:02
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A
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C
D
E

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During a 10-week summer vacation, was the average (arithmetic mean) number of
books that Carolyn read per week greater than the average number of books that Jacob
read per week?
(1) Twice the average number of books that Carolyn read per week was greater
than 5 less than twice the average number of books that Jacob read per week.
(2) During the last 5 weeks of the vacation, Carolyn read a total of 3 books more
than Jacob.
SVP
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Joined: 24 Aug 2006
Posts: 2135
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Kudos [?]: 87 [0], given: 0

Re: DS - Carolyn [#permalink] New post 23 Apr 2008, 08:11
saravalli wrote:
During a 10-week summer vacation, was the average (arithmetic mean) number of
books that Carolyn read per week greater than the average number of books that Jacob
read per week?
(1) Twice the average number of books that Carolyn read per week was greater
than 5 less than twice the average number of books that Jacob read per week.
(2) During the last 5 weeks of the vacation, Carolyn read a total of 3 books more
than Jacob.


First of all, this is a question testing averages, so it's at most a medium level question.

Let C = Caro's avg
Let J = Jacob's avg

a) 2C > 2J-5
b) Last 5 weeks is not enough information.

simple enough, and since it's an "at-most" medium level question, nothing tricky involved

I like A
Senior Manager
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Re: DS - Carolyn [#permalink] New post 23 Apr 2008, 16:19
For these kind of questions I will always try to plug in some values to make sure :

for S1 -

try c=4 , j=5 ; 2c>2j-5 is satisfied; c<j
try c=5 , j=4 ; 2c>2j-5 is satisfied; c>j

for S2 doesn't give any useful inforamation so answer is E . What is OA?
Director
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Re: DS - Carolyn [#permalink] New post 26 Apr 2008, 10:59
kidderek wrote:
saravalli wrote:
During a 10-week summer vacation, was the average (arithmetic mean) number of
books that Carolyn read per week greater than the average number of books that Jacob
read per week?
(1) Twice the average number of books that Carolyn read per week was greater
than 5 less than twice the average number of books that Jacob read per week.
(2) During the last 5 weeks of the vacation, Carolyn read a total of 3 books more
than Jacob.


First of all, this is a question testing averages, so it's at most a medium level question.

Let C = Caro's avg
Let J = Jacob's avg

a) 2C > 2J-5
b) Last 5 weeks is not enough information.

simple enough, and since it's an "at-most" medium level question, nothing tricky involved

I like A


Can you please refer to rpmodi's explanation above.
Thanks
Senior Manager
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Posts: 370
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Re: DS - Carolyn [#permalink] New post 26 Apr 2008, 11:24
rpmodi wrote:
For these kind of questions I will always try to plug in some values to make sure :

for S1 -

try c=4 , j=5 ; 2c>2j-5 is satisfied; c<j
try c=5 , j=4 ; 2c>2j-5 is satisfied; c>j

for S2 doesn't give any useful inforamation so answer is E . What is OA?


I went for A too...rmodi..good explanation. I am with E now.
SVP
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Joined: 24 Aug 2006
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Re: DS - Carolyn [#permalink] New post 26 Apr 2008, 23:20
saravalli wrote:
kidderek wrote:
saravalli wrote:
During a 10-week summer vacation, was the average (arithmetic mean) number of
books that Carolyn read per week greater than the average number of books that Jacob
read per week?
(1) Twice the average number of books that Carolyn read per week was greater
than 5 less than twice the average number of books that Jacob read per week.
(2) During the last 5 weeks of the vacation, Carolyn read a total of 3 books more
than Jacob.


First of all, this is a question testing averages, so it's at most a medium level question.

Let C = Caro's avg
Let J = Jacob's avg

a) 2C > 2J-5
b) Last 5 weeks is not enough information.

simple enough, and since it's an "at-most" medium level question, nothing tricky involved

I like A


Can you please refer to rpmodi's explanation above.
Thanks


I'm an ass. :oops:

A is insuff
Director
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Posts: 560
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Kudos [?]: 107 [0], given: 2

Re: DS - Carolyn [#permalink] New post 27 Apr 2008, 08:58
I too went for A in my practice test. :oops: I felt exactly the same way!!
Thanks.
Re: DS - Carolyn   [#permalink] 27 Apr 2008, 08:58
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