Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Exactly 14% of the reporters for a certain wire service [#permalink]
12 Jan 2011, 15:53

3

This post received KUDOS

00:00

A

B

C

D

E

Difficulty:

45% (medium)

Question Stats:

56% (02:32) correct
44% (02:14) wrong based on 75 sessions

Exactly 14% of the reporters for a certain wire service cover local politics in Country X. If 30% of the reporters who cover politics for the wire service do not cover local politics in Country X, what percent of the reporters for the wire service do not cover politics?

Re: Tough percent problem [#permalink]
12 Jan 2011, 16:07

2

This post received KUDOS

Expert's post

rxs0005 wrote:

Exactly 14% of the reporters for a certain wire service cover local politics in Country X. If 30% of the reporters who cover politics for the wire service do not cover local politics in Country X, what percent of the reporters for the wire service do not cover politics? (A) 20% (B) 42% (C) 44% (D) 80% (E) 84%

Let's assume there are 100 reporters --> 14 reporters cover local politics.

Now, as 30% of the reporters who cover all politics do not cover local politics then the rest 70% of the reporters who cover politics do cover local politics, so if there are x reporters who cover politics then 70% of them equal to 14 (# of reporters who cover local politics): 0.7x=14 --> x=20, hence 20 reporters cover politics and the rest 100-20=80 reporters do not cover politics at all.

Re: Tough percent problem [#permalink]
12 Jan 2011, 19:02

3

This post received KUDOS

Expert's post

rxs0005 wrote:

Exactly 14% of the reporters for a certain wire service cover local politics in Country X. If 30% of the reporters who cover politics for the wire service do not cover local politics in Country X, what percent of the reporters for the wire service do not cover politics?

(A) 20% (B) 42% (C) 44% (D) 80% (E) 84%

The wording does try to confuse you. Another method would be to take one sentence at a time and analyze its information. e.g.

Exactly 14% of the reporters for a certain wire service cover local politics in Country X

(14/100) * R = R_{LocPol}

If 30% of the reporters who cover politics for the wire service do not cover local politics in Country X (This means 30% politics reporters cover non-local politics)

(30/100) * R_{Pol} = R_{NonLocPol)

what percent of the reporters for the wire service do not cover politics?

We know, R_{LocPol} + R_{NonLocPol} = R_{Pol}

So, (\frac{14}{100})*R + (\frac{30}{100})*R_{Pol} = R_{Pol} (Using left hand sides of equations above) We get R_{Pol} = (\frac{20}{100})*R So, 80% reporters do not cover Politics.
_________________

Re: Tough percent problem [#permalink]
04 Jun 2011, 02:07

VeritasPrepKarishma wrote:

rxs0005 wrote:

Exactly 14% of the reporters for a certain wire service cover local politics in Country X. If 30% of the reporters who cover politics for the wire service do not cover local politics in Country X, what percent of the reporters for the wire service do not cover politics?

(A) 20% (B) 42% (C) 44% (D) 80% (E) 84%

The wording does try to confuse you. Another method would be to take one sentence at a time and analyze its information. e.g.

Exactly 14% of the reporters for a certain wire service cover local politics in Country X

(14/100) * R = R_{LocPol}

If 30% of the reporters who cover politics for the wire service do not cover local politics in Country X (This means 30% politics reporters cover non-local politics)

(30/100) * R_{Pol} = R_{NonLocPol)

what percent of the reporters for the wire service do not cover politics?

We know, R_{LocPol} + R_{NonLocPol} = R_{Pol}

So, (\frac{14}{100})*R + (\frac{30}{100})*R_{Pol} = R_{Pol} (Using left hand sides of equations above) We get R_{Pol} = (\frac{20}{100})*R So, 80% reporters do not cover Politics.

AWESOME! WOW! Thanks, Karishma! Actually, I was stuck in this problem's solution for a long time. Hooooooooffffffff! Feeling relieved after going through your explanation!

Re: Tough percent problem [#permalink]
10 Sep 2011, 00:01

The answer is 80%. A similar problem, although relatively simpler, if some of you want to work out, is available here: motorists-13233.html#p973017 _________________

Re: Tough percent problem [#permalink]
29 Dec 2011, 10:57

2

This post received KUDOS

All Reporters (assume 100) = Cover Politics (assume x) + Do not Cover Politics (100 -x)

Cover Politics = Cover Local Politics (14% of all reporters or 70% of reporters covering politics) + Do not Cover Local Politics (30% of reporters covering politics, 30% of x)

So 14% of all reporters = 70% of x 14 = 70% of x x = 20 Do not cover Politics = 100 -20 = 80…percentage 80%

Attachments

Politics Reporter.JPG [ 18.26 KiB | Viewed 1599 times ]

Last edited by RSG on 30 Dec 2011, 09:40, edited 2 times in total.

Re: Tough percent problem [#permalink]
13 Aug 2012, 10:48

BDSunDevil wrote:

using attached matrix: we have to find the y. .3x=X-14 So, X=20 Therefore, Y=80 80%

Thanks every one, for the explanation. I used the same table as BDsunDevil used only difference being i put "14" in the slot "total local politics" rather than in slot "Both politics and local politics" whic is not explicitly mentioned but is derived (14-0=14). It would have been better if "0" was logged under non politics tab in the table, just for better clarity.

Please correct me if I'M wrong.

Initially, I was also confused about this line "Exactly 14% of the reporters for a certain wire service cover local politics in Country X." . I took 14% to be the total local politics and completely ignored the fact that there can't be any local politics under non politics column.

Attachments

politics.jpg [ 20.71 KiB | Viewed 1113 times ]

_________________

Whatever one does in life is a repetition of what one has done several times in one's life! If my post was worth it, then i deserve kudos

Re: Exactly 14% of the reporters for a certain wire service [#permalink]
10 Mar 2014, 06:41

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________