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# Alternative Approach apart from Double Matrix

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Intern
Joined: 09 Apr 2017
Posts: 35
GPA: 3.99
Alternative Approach apart from Double Matrix  [#permalink]

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16 Jul 2017, 00:11
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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

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In the county of Veenapaniville, there are a total of 50 high schools, of three kinds: 25 public schools, 16 parochial schools, and 9 private independent schools.  These 50 schools are divided between three districts: A, B, and C. District A has 18 high schools total. District B has 17 high schools total, and only two of those are private independent schools.  If District C has an equal number of each of the three kinds of schools, how many private independent schools are there in District A?

(This is a question from the magoosh blog, using a method call double matrix)
I have a question, yes the method gives a very clear, structured answer, however, I have some doubt, given the time is to answer in 2mins. We are provided marker pen during the test.

Inclusive of drawing the tables and matrixes, it took me around 4 mins. any of you have alternative approach on this?

Thanks.

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Current Student
Joined: 18 Jan 2017
Posts: 81
Location: India
Concentration: Finance, Economics
GMAT 1: 700 Q50 V34
Re: Alternative Approach apart from Double Matrix  [#permalink]

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16 Jul 2017, 00:42
1
While the double matrix method does provide a more structured answer to ensure you don't miss out on important information. With practice you will realize you don't need all that data if you focus on what the stem is specifically asking for.

In this Q, we need to find the "how many private independent schools are there in District A". So isolate all the data related to that type of school.

We get the following statements on doing that:-

1) There are 9 private independent schools
2) District B has 17 high schools total, and only two of those are private independent schools
3) District C has an equal number of each of the three kinds of schools i.e of the total of 15 schools in District C, 5 are private independent schools

Thus the no of private independent schools in District A= Total no of private independent schools- private independent schools in B and C
= 9- 2-5 = 2

Hope that helps!
Math Expert
Joined: 02 Sep 2009
Posts: 55277
Re: Alternative Approach apart from Double Matrix  [#permalink]

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16 Jul 2017, 03:09
bae wrote:
In the county of Veenapaniville, there are a total of 50 high schools, of three kinds: 25 public schools, 16 parochial schools, and 9 private independent schools.  These 50 schools are divided between three districts: A, B, and C. District A has 18 high schools total. District B has 17 high schools total, and only two of those are private independent schools.  If District C has an equal number of each of the three kinds of schools, how many private independent schools are there in District A?

(This is a question from the magoosh blog, using a method call double matrix)
I have a question, yes the method gives a very clear, structured answer, however, I have some doubt, given the time is to answer in 2mins. We are provided marker pen during the test.

Inclusive of drawing the tables and matrixes, it took me around 4 mins. any of you have alternative approach on this?

Thanks.

This question is discussed here: in-the-county-of-veenapaniville-there-are-a-total-of-137972.html In case of any questions please post in that thread.

This topic is locked and archived.

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________
Re: Alternative Approach apart from Double Matrix   [#permalink] 16 Jul 2017, 03:09
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