GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 10 Dec 2018, 16:22

### 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

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

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### Free lesson on number properties

December 10, 2018

December 10, 2018

10:00 PM PST

11:00 PM PST

Practice the one most important Quant section - Integer properties, and rapidly improve your skills.
• ### Free GMAT Prep Hour

December 11, 2018

December 11, 2018

09:00 PM EST

10:00 PM EST

Strategies and techniques for approaching featured GMAT topics. December 11 at 9 PM EST.

# In certain year in Country C, x sets of twins and y sets of triplets

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 51072
In certain year in Country C, x sets of twins and y sets of triplets  [#permalink]

### Show Tags

24 Jul 2016, 08:12
00:00

Difficulty:

55% (hard)

Question Stats:

60% (01:18) correct 40% (01:08) wrong based on 162 sessions

### HideShow timer Statistics

In certain year in Country C, x sets of twins and y sets of triplets were born. If there were z total babies born in Country C in this year, and x and y were both greater than 0, which of the following represents the fraction of all babies born who were NOT part of a set of twins or triplets?

A. z - 2x - 3y
B. (2x+3y)/z
C. (x+y)/z
D. 1 - (2x+3y)/z
E. 1 - (x+y)/z

_________________
Board of Directors
Status: Stepping into my 10 years long dream
Joined: 18 Jul 2015
Posts: 3613
In certain year in Country C, x sets of twins and y sets of triplets  [#permalink]

### Show Tags

24 Jul 2016, 08:42
1
Bunuel wrote:
In certain year in Country C, x sets of twins and y sets of triplets were born. If there were z total babies born in Country C in this year, and x and y were both greater than 0, which of the following represents the fraction of all babies born who were NOT part of a set of twins or triplets?

A. z - 2x - 3y
B. (2x+3y)/z
C. (x+y)/z
D. 1 - (2x+3y)/z
E. 1 - (x+y)/z

X set of twins implies 2x babies of twin category.
Y set of triplets means 3y babies of triplet category.

Let K be the babies other than twin or triplet category.

Total babies = z = 2x+3y+k.

or K=Z-(2x+3y)

=> Fraction of babies other than twin or triplet categories = K/Z = Z-(2x+3y)/Z.

= 1- (2x+3y)/Z. Hence answer is D.
_________________

My GMAT Story: From V21 to V40
My MBA Journey: My 10 years long MBA Dream
My Secret Hacks: Best way to use GMATClub | Importance of an Error Log!
Verbal Resources: All SC Resources at one place | All CR Resources at one place

GMAT Club Inbuilt Error Log Functionality - View More.
New Visa Forum - Ask all your Visa Related Questions - here.
New! Best Reply Functionality on GMAT Club!
Find a bug in the new email templates and get rewarded with 2 weeks of GMATClub Tests for free
Check our new About Us Page here.

Non-Human User
Joined: 09 Sep 2013
Posts: 9098
Re: In certain year in Country C, x sets of twins and y sets of triplets  [#permalink]

### Show Tags

14 Nov 2018, 03:52
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.
_________________
Re: In certain year in Country C, x sets of twins and y sets of triplets &nbs [#permalink] 14 Nov 2018, 03:52
Display posts from previous: Sort by