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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

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:

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

Show Tags

17 Feb 2010, 16:25

6

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

25% (medium)

Question Stats:

70% (02:09) correct
30% (01:00) wrong based on 210 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.

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?

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

Show Tags

17 Feb 2010, 16:33

1

This post received KUDOS

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.

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.

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

Show Tags

17 Feb 2010, 16:35

1

This post received KUDOS

1

This post was BOOKMARKED

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.

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.
_________________

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

Show Tags

17 Feb 2010, 18:42

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!
_________________

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

Show Tags

18 Feb 2010, 19:19

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!

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

Show Tags

16 Nov 2015, 20:14

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.
_________________

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

Show Tags

27 Jan 2017, 07:35

TheSituation 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.

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?

This fraction problem contains an unspecified total (the number of married couples) and is most easily solved by a picking a "smart" number for that total. The smart number is the least common denominator of all the fractions in the problem. In this case, the smart number is 20.

Let's say there are 20 married couples. 15 couples ( \(\frac{3}{{4}}\) of the total) have more than one child. 8 couples ( \(\frac{2}{{5}}\) of the total) have more than three children. This means that 15 – 8 = 7 couples have either 2 or 3 children. Thus 7/20 of the married couples have either 2 or 3 children.

The correct answer is C.

gmatclubot

3/4 of all married couples have more than one child. 2/5 of all marrie
[#permalink]
27 Jan 2017, 07:35

Its been long time coming. I have always been passionate about poetry. It’s my way of expressing my feelings and emotions. And i feel a person can convey...

Written by Scottish historian Niall Ferguson , the book is subtitled “A Financial History of the World”. There is also a long documentary of the same name that the...

Post-MBA I became very intrigued by how senior leaders navigated their career progression. It was also at this time that I realized I learned nothing about this during my...