Summer is Coming! Join the Game of Timers Competition to Win Epic Prizes. Registration is Open. Game starts Mon July 1st.

It is currently 19 Jul 2019, 13:50

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.

Close

Request Expert Reply

Confirm Cancel

The ratio of boys to girls in a school is 9 to 11. After 36 more girls

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 56300
The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 18 Oct 2016, 02:12
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (01:41) correct 15% (02:25) wrong based on 120 sessions

HideShow timer Statistics


Intern
Intern
avatar
Status: reappearing for gmat
Joined: 10 Jul 2016
Posts: 34
Location: India
Concentration: Entrepreneurship, Finance
GPA: 3.78
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 18 Oct 2016, 02:21
2
Bunuel wrote:
The ratio of boys to girls in a school is 9 to 11. After 36 more girls join, the ratio becomes 9 to 13. How many boys are there in the school?

A. 102
B. 115
C. 132
D. 162
E. 234



Boys : Girls
9 : 11

let the boys be 9x and the girls be 11x. Now, 36 more girls are added -------> 9:13(new ratio).

so,

9x/(11x+36) =9/13.

solving,

We get : x=18

so No. of boys in the school are :9x= 9*18= 162

hence (D)
_________________
go with the flow

KUDOS +1 if you like the post :)
Manager
Manager
avatar
B
Joined: 28 Jun 2016
Posts: 216
Location: Canada
Concentration: Operations, Entrepreneurship
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 18 Oct 2016, 02:27
Let x be ratio multiplier at first and y be the ratio multiplier after adding 36.

9y/13y=9x/11x+36

Equate numerator and denominator

9y=9x

y=x

13y=11x+36

13y-11y=36

y=18

Number of boys = 9*18 = 162

D


Sent from my iPhone using GMAT Club Forum mobile app
Retired Moderator
avatar
G
Joined: 26 Nov 2012
Posts: 586
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 18 Oct 2016, 02:52
Bunuel wrote:
The ratio of boys to girls in a school is 9 to 11. After 36 more girls join, the ratio becomes 9 to 13. How many boys are there in the school?

A. 102
B. 115
C. 132
D. 162
E. 234


Given B/G = 9/11 => B = 9G/11

Now 36 girls are added then ratio changes.

B/G+36 = 9/13. Now sub B value in this equation.

9G/11(G+36) = 9/13 => G = 198 and B = 162.

IMO option C.
Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4512
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 18 Oct 2016, 09:03
2
2
Bunuel wrote:
The ratio of boys to girls in a school is 9 to 11. After 36 more girls join, the ratio becomes 9 to 13. How many boys are there in the school?

A. 102
B. 115
C. 132
D. 162
E. 234


13x - 11x = 36

So, 2x = 36

x = 18

So, No of boys is 9*18 =162

Answer will be (D) 162

Similar Question : a-fresh-water-aquarium-contains-molly-fish-and-guppy-fish-at-a-ratio-227448.html
_________________
Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )
Board of Directors
User avatar
V
Status: Stepping into my 10 years long dream
Joined: 18 Jul 2015
Posts: 3625
Reviews Badge
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 20 Oct 2016, 05:43
msk0657 wrote:
Bunuel wrote:
The ratio of boys to girls in a school is 9 to 11. After 36 more girls join, the ratio becomes 9 to 13. How many boys are there in the school?

A. 102
B. 115
C. 132
D. 162
E. 234


Given B/G = 9/11 => B = 9G/11

Now 36 girls are added then ratio changes.

B/G+36 = 9/13. Now sub B value in this equation.

9G/11(G+36) = 9/13 => G = 198 and B = 162.

IMO option C.


I think you meant D. :-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
Blog: Subscribe to Question of the Day Blog
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.
Current Student
User avatar
B
Status: DONE!
Joined: 05 Sep 2016
Posts: 368
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 27 Oct 2016, 20:22
9x/(11x+36) = 9/13
117x=99x+324
18x=324
x=18

9x = 9(18) = 162
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 11709
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls  [#permalink]

Show Tags

New post 09 Mar 2018, 19:48
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 Club Bot
Re: The ratio of boys to girls in a school is 9 to 11. After 36 more girls   [#permalink] 09 Mar 2018, 19:48
Display posts from previous: Sort by

The ratio of boys to girls in a school is 9 to 11. After 36 more girls

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





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne