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10-WEEK SUMMER VACATION

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by success1111 » Wed Apr 22, 2009 7:48 pm
Hi,
i need help on this question.

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.
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Source: — Data Sufficiency |
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by ncr_10 » Wed Apr 22, 2009 8:32 pm
Whats the OA ?

1. 2*C > 2*J - 5, where C and J are Carolyn's and Jacob's avg.

If C = 10 and J = 11, the eqn holds good
If C = 10 and J = 9, the eqn holds good.
So we can't decide if C > J or C < J. Insufficient.


2. What if Jacob read more books in the first 5 weeks ? So this
is again insufficient.

We can't come to a conclusion combining both the stems either. So E.
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by Sher1 » Wed Apr 22, 2009 8:35 pm
I think it is E

Question says

Is Ac > Aj
or Ac-Aj>0

St1

2Ac>2Aj-5
Ac-Aj>-5/2
No Suff

St 2

Info for the last 5 weeks no suff


1 & 2

Don't think they help solve the problem when combined

Whats OA
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by success1111 » Wed Apr 22, 2009 9:07 pm
Thanks for the inputs.However,i need more response before i can post official answers.
DanaJ,Staurt,Steward, and other experts,please help.
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by lilu » Wed Apr 22, 2009 9:15 pm
success1111 wrote:Thanks for the inputs.However,i need more response before i can post official answers.
DanaJ,Staurt,Steward, and other experts,please help.
Stuart has already posted an answer to this question:
https://www.beatthegmat.com/set-24-q-12-t4975.html
The more you look, the more you see.
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by success1111 » Wed Apr 22, 2009 9:42 pm
lilu wrote:
success1111 wrote:Thanks for the inputs.However,i need more response before i can post official answers.
DanaJ,Staurt,Steward, and other experts,please help.
Stuart has already posted an answer to this question:
https://www.beatthegmat.com/set-24-q-12-t4975.html

Thanks.However,i dont agree that the answer is E.The OA says A.
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by rossmj » Thu Apr 23, 2009 7:20 am
Answer is definitely E.

We want to know if AvgC>AvgJ

Stmt 1

2AvgC>2AvgJ-5 if we divide by 2 we get
AvgC>AvgJ-2.5 we can rearrange further to get
2.5>AvgJ-AvgC or AvgC-AvgJ>-2.5 either way the difference could be positive negative or zero INSUFF.

Stmt 2

Knowing about the last 5 weeks doesn't help.

Together still nothing.

Are you positive that you wrote the question out properly. If statement 1 said something about 2AvgC>2AvgJ-5 in the first 5 weeks and statement 2 remained the same the answer would be C.
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by success1111 » Fri Apr 24, 2009 5:19 pm
rossmj wrote:Answer is definitely E.

We want to know if AvgC>AvgJ

Stmt 1

2AvgC>2AvgJ-5 if we divide by 2 we get
AvgC>AvgJ-2.5 we can rearrange further to get
2.5>AvgJ-AvgC or AvgC-AvgJ>-2.5 either way the difference could be positive negative or zero INSUFF.

Stmt 2

Knowing about the last 5 weeks doesn't help.

Together still nothing.

Are you positive that you wrote the question out properly. If statement 1 said something about 2AvgC>2AvgJ-5 in the first 5 weeks and statement 2 remained the same the answer would be C.

The question is correct.
The OA is A but I got E with different method but similar to yours.

Thanks everyone for your inputs.
Trust but verify.
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by Vemuri » Sat Apr 25, 2009 4:45 am
success1111 wrote:
The question is correct.
The OA is A but I got E with different method but similar to yours.

Thanks everyone for your inputs.
Hi success1111. What is the source of this question & do you have an OA explanation?
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by success1111 » Sat Apr 25, 2009 8:47 pm
Vemuri wrote:
success1111 wrote:
The question is correct.
The OA is A but I got E with different method but similar to yours.

Thanks everyone for your inputs.
Hi success1111. What is the source of this question & do you have an OA explanation?

I dont have official explanation.The question is a retired gmat question.
Trust but verify.
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