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During a 10-week summer vacation, was the average

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Manager
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During a 10-week summer vacation, was the average [#permalink] New post 09 Sep 2004, 10:52
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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.
Director
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 [#permalink] New post 09 Sep 2004, 11:56
1. Insufficient. If Carolyn had read 5 books and Jacob had read 6 books i a week, we have 10>12-5 which means Jacob read more than Carolyn. However, if Jacob had read 4 books then again 10>8-5. This time Carolyn has read more. So, we dont know.
2. Insufficient. We dont know about the first 5 weeks. Jacob could have read more.

Both combined, still unclear. So, E.

feel like :sleep. Cant think at this hour..
Manager
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 [#permalink] New post 04 Sep 2006, 10:05
I saw this question on my practice test and the OA says A. Can someone help to explain? or my OA is wrong?
Senior Manager
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 [#permalink] New post 06 Sep 2006, 02:13
A

average number of books that Carolyn read per week = C
average number of books that Jacob read per week= J

question is asking : is C > J

From (1)

2C > 2J - 5 => c > J
Senior Manager
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 [#permalink] New post 06 Sep 2006, 10:07
AK wrote:
A

average number of books that Carolyn read per week = C
average number of books that Jacob read per week= J

question is asking : is C > J

From (1)

2C > 2J - 5 => c > J


:no if c=5, j=7 then c > j -5/2 i.e. 5 > 4.5
CEO
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 [#permalink] New post 06 Sep 2006, 10:14
E

Let C - Av books read by Carolyn
J - Av books read by Jacob

We have to find if C-J > 0??

St1: 2C > 2J - 5
C - J > -5/2
C-J could be +ve or -ve. : INSUFF

St2: Clearly INSUFF

Together:
St2 is not helping st1. : INSUFF

_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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 [#permalink] New post 06 Sep 2006, 10:35
Answer: E
Q: Cavg > Javg

S1: Cavg > J -2.5
Not sufficient.

S2: Not sufficient.

S1 & S2: Provides no further insight...

Answer: E
  [#permalink] 06 Sep 2006, 10:35
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