GMAT:Punch of the Week(30-March-09)

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Sureshbala

GMAT:Punch of the Week(30-March-09)

Author: Sureshbala

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What is "Punch Of The Week"?

Every week Learnhub's team will post one question each on Verbal Ability and Quantitative Ability of the GMAT Test Preparation
Members can post their answers along with explanations for the next one week.
After one week, Learnhub's team will post the official answer along with the explanation.Besides answering the previous week's questions, Learnhub's Team will come up with the next set of questions for that week as well.

What are the rules of "Punch Of The Week"?

	Every user must refrain from posting sarcastic comments on the answers posted by others.
	Once the Learnhub's team posts the official answer along with the explanation, no comments must be made regarding those questions. In case of further clarification please send a personal message to the respective team member
	If you think that there is something wrong with the explanation of the Learnhub's Team, which seldom happens, please send a personal message to the respective team member informing him/her the same. Posting the same here will not be considered and will be deleted.
	Please bear in mind that only Learnhub's Team members have the privilege of posting questions here. Questions posted by other members will not be entertained and hence will be deleted immediately.

"Punch Of The Week" Team Members

This Week's Punches

Critical Reasoning

A medical journal used a questionnaire survey to determine whether a particular change in its format would increase its readership.Sixty-two percent of those who returned the questionnaire supported that change.On the basis of this outcome, the decision was made to introduce the new format.

Which one of the following, if it were determined to be true, would provide the best evidence that the journal's decision will have the desired effect?

(A) Of the readers who received questionnaires, 90 percent returned them.

(B) Other journals have based format changes on survey results.

(C) The percentage of surveyed readers who like the format change was almost the same as the percentage of the entire potential readership who would like the format change.

(D) It was determined that the new format would be less costly than the old format.

(E) Ninety percent of the readers who were dissatisfied with the old format and only 50 percent of the readers who liked the old format returned their questionnaires.

Problem Solving

Participation in the local soccer league this year is 10% higher than last year.The number of males increased by 5% and the number of females increased by 20%. What fraction of the soccer league is now female?
$A. \frac{1}{3}$
$B. \frac{4}{11}$
$C. \frac{2}{5}$
$D. \frac{4}{9}$
$E. \frac{1}{2}$

Click here for last week's Punch and explanatory answers for the same

Posted on 06-April-09

So,folks here are the correct answers

Critical Reasoning
The correct answer is C. The argument generalizes from the survey to the general readership, so the reliability of the projection depends on how representative the sample is. At first glance, choice (A) seems rather good; 90% is an excellent return for any survey. However, it has a flaw-we don't know what percentage of the readers received the survey. Perhaps only a few questionnaires were sent out. Choice (B) is irrelevant since we don't know whether the decisions had the desired effect. Choice C points out that the survey is representative of the potential readership. Hence, it should be accurate. The answer is C.

Problem Solving
The correct answer is (B).

If m and w are the current number of men and women then we have

$\frac{m}{1.05} + \frac{w}{1.20} = \frac{m+w}{1.10}$
$\Rightarrow m (\frac{1}{1.05} - \frac{1}{1.10})$ $= w(\frac{1}{1.10} - \frac{1}{1.20})$
$\Rightarrow \frac{m}{w}=\frac{7}{4}$
$\Rightarrow \frac{w}{m}=\frac{4}{7}$
$\Rightarrow \frac{w}{m+w}=\frac{4}{11}$

Click here for the next week's Punch

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13 Comments

rkmittal said – Tue, 31 Mar 2009 10:05:49 -0000 ( Flag Edit Link )

C & B.

PS: Let m be the no. of males and f be the no. of females last year.

So, total members last year = m + f

Total members this year = 1.1 (m+f)

Now, it is given that 1.1 (m+f) = 1.05 m + 1.2 f

Hence, 0.05 m = 0.1 f

or m = 2f

Fraction of females to total members of soccer league this year = 1.2f/(1.1m+1.1f)

Substituting m=2f, we get the desired fraction as = 1.2f/3.3f = 1.2/3.3 = 12/33 = 4/11

So, answer is B.
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tyagideepa said – Tue, 31 Mar 2009 18:17:14 -0000 ( Flag Edit Link )

CR – C , PS – B
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sanju09 said – Wed, 01 Apr 2009 11:06:17 -0000 ( Flag Edit Link )

Problem Solving
Let there be x females and 100 – x males in the last year’s local soccer league. This year has seen 1.2 x females and 1.05 (100 – x) males such that 1.2 x +1.05 (100 – x) = 110 or x = 100/3, or 1.2 x = 40; and 40/110 = 4/11. Catch B
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Harikishore said – Wed, 01 Apr 2009 12:06:57 -0000 ( Flag Edit Link )

Answers for CR is© and PS is (B).

Please eloborate on the answer explanation of last week’s CR question, Why not C? You have explained why E is correct. It would be helpful if you explain why the other alternatives are not correct. It gives a complete picture
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1. chetan2u said – Wed, 01 Apr 2009 12:57:04 -0000 ( Flag Edit Link )
  
  hi hari… as for the ans of last week’s CR being E … C just suggests harm of producing nukes in terms of an accident and does not touch upon war aspect whereas E gives a causal reasoning ie there can be some reasons other than nuke detterance for w war not to happen. other pts are either out of scope or do not weaken argument
  
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chetan2u said – Wed, 01 Apr 2009 13:39:49 -0000 ( Flag Edit Link )

cr-c..ps-b
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vineetgoyal123 said – Wed, 01 Apr 2009 16:29:13 -0000 ( Flag Edit Link )

ans of CR is C and ans of PS is B
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Ori0n said – Wed, 01 Apr 2009 19:05:37 -0000 ( Flag Edit Link )

CR – A; PS – B
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rneve said – Thu, 02 Apr 2009 07:07:16 -0000 ( Flag Edit Link )

CR :=> C PS :=> B
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Jishnavi said – Sun, 05 Apr 2009 13:20:39 -0000 ( Flag Edit Link )

CR D, PS B
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i_m_wat_i_m said – Mon, 06 Apr 2009 06:42:44 -0000 ( Flag Edit Link )

CR C and for PS its B.
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dgr8onerip said – Mon, 06 Apr 2009 07:03:40 -0000 ( Flag Edit Link )

The answer to the quant question is B i.e. 4/11 i have the same explanation like the ones mentioned above

but my answer for the cr is E

FACTS- 1) questionnaire was given to readers but number of readers is unknown 2) The number of people who returned the questionnaire is unknown 3) of the people who returned 62% said yes while 38% said no. 4) The magazines went ahead with the changes

Which one of the following, if it were determined to be true, would provide the best evidence that the journal’s decision will have the desired effect?

(A) Of the readers who received questionnaires, 90 percent returned them. (it kinda supports the change but if all of the remaining 10% said no then the proportion of yes/ no would be 50-50

(B) Other journals have based format changes on survey results. (this does not state any connection to the statistical evidence provided)

(C) The percentage of surveyed readers who like the format change was almost the same as the percentage of the entire potential readership who would like the format change. (this supports the change well.. acc to this 62% of the people want the change)

(D) It was determined that the new format would be less costly than the old format. (no connection to the statistical evidence)

(E) Ninety percent of the readers who were dissatisfied with the old format and only 50 percent of the readers who liked the old format returned their questionnaires. (now is the tricky part- suppose the questionnaire was distributed to x people. m liked the changes while x-m did not. the statement states that 90% of (x-m) returned the questionnaire while only half of x returned it to them. but 90% of (x-m) = 38% of all people given the questionnaire while 50% of x = 62% of all ppl given the questionnaire thus the actual value of x will be much more than 62; in fact it will be around 75%. Thus this decision to go ahead with the changes is correct)

I agree that c also helps is answering but E actually proves why this decision was correct.. E shows that the number of ppl who wanted the change was actually much more than that stated by statement C
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arvind70 said – Mon, 06 Apr 2009 11:53:36 -0000 ( Flag Edit Link )

CR- C PS- B
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Sureshbala said – Mon, 06 Apr 2009 19:47:28 -0000 ( Flag Edit Link )

So,folks here are the correct answers

Critical Reasoning
The correct answer is C. The argument generalizes from the survey to the general readership, so the reliability of the projection depends on how representative the sample is. At first glance, choice (A) seems rather good; 90% is an excellent return for any survey. However, it has a flaw—we don’t know what percentage of the readers received the survey. Perhaps only a few questionnaires were sent out. Choice (B) is irrelevant since we don’t know whether the decisions had the desired effect. Choice C points out that the survey is representative of the potential readership. Hence, it should be accurate. The answer is C.