Find all School-related info fast with the new School-Specific MBA Forum

It is currently 26 May 2016, 13:32
GMAT Club Tests

Close

GMAT Club Daily Prep

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

3/4 of all married couples have more than one child. 2/5 of all marrie

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
User avatar
Joined: 09 Dec 2009
Posts: 122
Followers: 4

Kudos [?]: 36 [0], given: 19

3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 17 Feb 2010, 17:25
3
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

66% (02:12) correct 34% (00:58) wrong based on 113 sessions

HideShow timer Statistics

3/4 of all married couples have more than one child. 2/5 of all married couples have more than 3 children. What fraction of all married couples have 2 or 3 children?

A. 1/5
B.1/4
C. 7/20
D. 3/5
E. It cannot be determined from the given information.


[Reveal] Spoiler:
Source: MGMAT.

I'm debating this answer. I understand how they derive it when you make the assumption that ALL married couples have kids but the fact that it DOES NOT explicitly say what fraction of couples have no kids we do not have sufficient to information to conclusively answer the question asked. Am I missing something?
[Reveal] Spoiler: OA

_________________

G.T.L. - GMAT, Tanning, Laundry

Round 1: 05/12/10 handling-a-grenade-thesituation-s-official-debrief-94181.html

Round 2: 07/10/10 - This time it's personal.

Senior Manager
Senior Manager
avatar
Joined: 25 Jun 2009
Posts: 306
Followers: 2

Kudos [?]: 107 [0], given: 6

Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 17 Feb 2010, 17:33
Currency wrote:
3/4 of all married couples have more than one child. 2/5 of all married couples have more than 3 children. What fraction of all married couples have 2 or 3 children?


A. 1/5
B.1/4
C. 7/20
D. 3/5
E. It cannot be determined from the given information.

[Reveal] Spoiler:
C


Source: MGMAT.

I'm debating this answer. I understand how they derive it when you make the assumption that ALL married couples have kids but the fact that it DOES NOT explicitly say what fraction of couples have no kids we do not have sufficient to information to conclusively answer the question asked. Am I missing something?


I guess its right, lets take step by step, Lets assume there are 100 couple in total

now according to the question stem 3/4 of all married couples have more than one child
i.e 75 couples have more than one child and rest of them (25 couples have either one or none )

second part of the question says 2/5 of all married couples have more than 3 children
i.e 40 couples have 3 + children.

Question asks us to calculate couple with either or 2 or 3 children.

now we know 25 couples have either one or none children and 35 ( 75-40) have either 2 or 3 children

Hence 35/100 = 7/20 is the answer.

To add on to it we explicitly dont have to calculate how many couples have 0 kids we just need the number of couples who have 2 or 3 kids which can be calculated as shown above.

I hope that helps.
Senior Manager
Senior Manager
User avatar
Joined: 21 Jul 2009
Posts: 366
Schools: LBS, INSEAD, IMD, ISB - Anything with just 1 yr program.
Followers: 17

Kudos [?]: 140 [0], given: 22

Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 17 Feb 2010, 17:35
Currency wrote:
3/4 of all married couples have more than one child. 2/5 of all married couples have more than 3 children. What fraction of all married couples have 2 or 3 children?


A. 1/5
B.1/4
C. 7/20
D. 3/5
E. It cannot be determined from the given information.

[Reveal] Spoiler:
C


Source: MGMAT.

I'm debating this answer. I understand how they derive it when you make the assumption that ALL married couples have kids but the fact that it DOES NOT explicitly say what fraction of couples have no kids we do not have sufficient to information to conclusively answer the question asked. Am I missing something?


Plug in simple numbers. Take 100 couples for example.

3/4 of 100 couples have more than one child = 75 couples.
2/5 of 100 couples have more than 3 kids = 40 couples.
This implies that 40 couples are a subset of 75 couples and the complement of 75 couples within those 100 couples, which equals 25 couples have either one or no kids at all.
We need to find couples that have 2 or 3 kids, so essentially, it is 75 - 40 = 35. Fraction will be 35/100 = 7/20.
_________________

I am AWESOME and it's gonna be LEGENDARY!!!

Manager
Manager
avatar
Joined: 10 Feb 2010
Posts: 193
Followers: 2

Kudos [?]: 81 [0], given: 6

Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 17 Feb 2010, 18:48
C

100 Married couples.

1 or more = 75
4 or more = 40
2 or 3 = 75-40 = 35

35/100 = 7/20
Manager
Manager
User avatar
Joined: 09 Dec 2009
Posts: 122
Followers: 4

Kudos [?]: 36 [0], given: 19

Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 17 Feb 2010, 19:42
Thanks fellas. I see the solution now. Makes sense when you grind it out.

One of my trouble spots is not fully grinding out a problem when I believe it to be unsolvable after reading thru the question. I get this more on DS questions.

In any event, thanks for the help!
_________________

G.T.L. - GMAT, Tanning, Laundry

Round 1: 05/12/10 handling-a-grenade-thesituation-s-official-debrief-94181.html

Round 2: 07/10/10 - This time it's personal.

1 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 01 Feb 2010
Posts: 267
Followers: 1

Kudos [?]: 47 [1] , given: 2

Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 18 Feb 2010, 08:39
1
This post received
KUDOS
Couples with two or three children = 3/4 - 2/5 = 7/20 hence C.
Manager
Manager
avatar
Joined: 10 Feb 2010
Posts: 193
Followers: 2

Kudos [?]: 81 [0], given: 6

Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 18 Feb 2010, 20:19
Currency wrote:
Thanks fellas. I see the solution now. Makes sense when you grind it out.

One of my trouble spots is not fully grinding out a problem when I believe it to be unsolvable after reading thru the question. I get this more on DS questions.

In any event, thanks for the help!


By practicing, you will be able to think thru logically while reading the question. Also, just reading the questions on the forums and solving helps a lot!
Manager
Manager
avatar
Joined: 15 Feb 2010
Posts: 62
Location: Tokyo
Schools: Insead
Followers: 2

Kudos [?]: 12 [0], given: 15

GMAT ToolKit User
Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 18 Feb 2010, 22:29
bangalorian2000 wrote:
Couples with two or three children = 3/4 - 2/5 = 7/20 hence C.


NICE AND EASY! I LIKE IT!
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 9639
Followers: 465

Kudos [?]: 120 [0], given: 0

Premium Member
Re: 3/4 of all married couples have more than one child. 2/5 of all marrie [#permalink]

Show Tags

New post 16 Nov 2015, 21:14
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.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: 3/4 of all married couples have more than one child. 2/5 of all marrie   [#permalink] 16 Nov 2015, 21:14
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Derrick and Lena a married couple attending the same himanshuhpr 3 28 Nov 2012, 11:11
3 Experts publish their posts in the topic There are 5 married couples and a group of three is to be petrifiedbutstanding 2 29 Jan 2011, 14:19
45 Experts publish their posts in the topic If 4 people are selected from a group of 6 married couples bibha 22 13 Aug 2010, 08:42
8 Experts publish their posts in the topic There are 5 married couples and a group of three is to be jallenmorris 8 19 Jul 2008, 17:53
44 Experts publish their posts in the topic Given that there are 6 married couples. If we select only 4 dominion 33 18 Jan 2008, 01:05
Display posts from previous: Sort by

3/4 of all married couples have more than one child. 2/5 of all marrie

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.