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

It is currently 18 Jan 2019, 16:17

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
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • Free GMAT Strategy Webinar

     January 19, 2019

     January 19, 2019

     07:00 AM PST

     09:00 AM PST

    Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
  • FREE Quant Workshop by e-GMAT!

     January 20, 2019

     January 20, 2019

     07:00 AM PST

     07:00 AM PST

    Get personalized insights on how to achieve your Target Quant Score.

In a certain district, the ratio of the number of registered

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

Hide Tags

 
Manager
Manager
avatar
Joined: 11 Jul 2016
Posts: 80
Re: In a certain district, the ratio of the number of registered  [#permalink]

Show Tags

New post 27 Oct 2016, 08:20
Bunuel Can you please guide where I am getting wrong ?

R/D = 3/5 -----(1)

R+600 / D+500 = 4/5 ----(2)

Solving (2) we get

1000 = 4D - 5R

Substitute value of R from (1)

1000 = 4D - 5* (3D/5)

D = 1000

Hence R = 600

So difference should be 400 ??
Target Test Prep Representative
User avatar
P
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 4547
Location: United States (CA)
Re: In a certain district, the ratio of the number of registered  [#permalink]

Show Tags

New post 27 Oct 2016, 09:05
3
The difference of 400 is before the new registrations. But the problems asks for "After these (new) registrations..." So the new number of registered Republicans is 600 + 600 = 1200, and the new number of registered Democrats is 1000 + 500 = 1500. So the difference is 300.

Does that make sense?
_________________

Scott Woodbury-Stewart
Founder and CEO

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Manager
Manager
avatar
Joined: 11 Jul 2016
Posts: 80
Re: In a certain district, the ratio of the number of registered  [#permalink]

Show Tags

New post 27 Oct 2016, 09:25
ScottTargetTestPrep wrote:
The difference of 400 is before the new registrations. But the problems asks for "After these (new) registrations..." So the new number of registered Republicans is 600 + 600 = 1200, and the new number of registered Democrats is 1000 + 500 = 1500. So the difference is 300.

Does that make sense?


I agree to your explanation as its evident from the answer.

My query is algebraically where I am getting wrong? Is it that at the time if expressing a Q into ratios , we need to provide a constant 'k' or 'x' everytime
What is the significance of this constant?
Target Test Prep Representative
User avatar
P
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 4547
Location: United States (CA)
Re: In a certain district, the ratio of the number of registered  [#permalink]

Show Tags

New post 31 Oct 2016, 07:46
I think you're getting confused with the variables that you created. When you make up variables in your equation, you need to know what those variables stand for - what they represent.. For example, what does the variable D correspond to? Right? Otherwise, your algebra looks fine. You just have to be careful to answer the question that is being asked. I hope this helps...
_________________

Scott Woodbury-Stewart
Founder and CEO

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1152
In a certain district, the ratio of the number of registered  [#permalink]

Show Tags

New post 31 Oct 2016, 18:54
Walkabout wrote:
In a certain district, the ratio of the number of registered Republicans to the number of registered Democrats was 3/5. After 600 additional Republicans and 500 additional Democrats registered, the ratio was 4/5. After these registrations, there were how many more voters in the district registered as Democrats than as Republicans?

(A) 100
(B) 300
(C) 400
(D) 1,000
(E) 2,500


let t=total original registrations
3/8*t+600=4/9*(t+1100)
t=1600
t+1100=2700 revised total
5/9*2700=1500 democrats
4/9*2700=1200 republicans
1500-1200=300
B
Intern
Intern
avatar
B
Joined: 22 Oct 2017
Posts: 31
Re: In a certain district, the ratio of the number of registered  [#permalink]

Show Tags

New post 03 Nov 2017, 06:24
Does anybody know a solution with the ratio box?
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 9431
Premium Member
Re: In a certain district, the ratio of the number of registered  [#permalink]

Show Tags

New post 28 Nov 2018, 05:25
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

GMAT Club Bot
Re: In a certain district, the ratio of the number of registered &nbs [#permalink] 28 Nov 2018, 05:25

Go to page   Previous    1   2   [ 27 posts ] 

Display posts from previous: Sort by

In a certain district, the ratio of the number of registered

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


cron
Copyright

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

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

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®.