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

It is currently 10 Dec 2018, 20:40

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 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.

The population of Town X on January 1, 2010, was 56 percent greater...

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

Hide Tags

Director
Director
User avatar
D
Joined: 11 Feb 2015
Posts: 609
Premium Member CAT Tests
The population of Town X on January 1, 2010, was 56 percent greater...  [#permalink]

Show Tags

New post 08 Jul 2018, 08:55
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

80% (01:02) correct 20% (01:44) wrong based on 30 sessions

HideShow timer Statistics

The population of Town X on January 1, 2010, was 56 percent greater than the population of the same town on January 1, 2005. The population of Town X on January 1, 2015, was 75 percent greater than the population of the same town on January 1, 2010. What was the population of Town X on January 1, 2005?

(1) The population of Town X on January 1, 2015, was 21,840.

(2) The increase in the population of Town X from January 1, 2010, to January 1, 2015, was 4,880 greater than the increase in the population of Town X from January 1, 2005, to January 1, 2010.

_________________

"Please hit :thumbup: +1 Kudos if you like this post" :student_man:

_________________
Manish :geek:

"Only I can change my life. No one can do it for me"

Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 7100
The population of Town X on January 1, 2010, was 56 percent greater...  [#permalink]

Show Tags

New post 08 Jul 2018, 09:20
CAMANISHPARMAR wrote:
The population of Town X on January 1, 2010, was 56 percent greater than the population of the same town on January 1, 2005. The population of Town X on January 1, 2015, was 75 percent greater than the population of the same town on January 1, 2010. What was the population of Town X on January 1, 2005?

(1) The population of Town X on January 1, 2015, was 21,840.

(2) The increase in the population of Town X from January 1, 2010, to January 1, 2015, was 4,880 greater than the increase in the population of Town X from January 1, 2005, to January 1, 2010.



let the population of town X be X in 2005..
so in 2010 it becomes 1.56X and in 2015 it becomes 1.75*1.56X..
so all the populations are in term of X

if you know population of any one of the year, you will get X

(1) The population of Town X on January 1, 2015, was 21,840.
so 1.75*1.56X=21840
we can get X
suff

(2) The increase in the population of Town X from January 1, 2010, to January 1, 2015, was 4,880 greater than the increase in the population of Town X from January 1, 2005, to January 1, 2010.
so 1.75*1.56X-1.56X=4880+1.56X-X
so you have one term free of variable and rest all terms in X, we can find X
Suff

D
we dont have to try to find the values. knowing that equation will give us a value, Move ahead

Edit: Edited typo

_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


GMAT online Tutor

Director
Director
User avatar
P
Joined: 14 Dec 2017
Posts: 519
Location: India
Premium Member
Re: The population of Town X on January 1, 2010, was 56 percent greater...  [#permalink]

Show Tags

New post 09 Jul 2018, 02:07
CAMANISHPARMAR wrote:
The population of Town X on January 1, 2010, was 56 percent greater than the population of the same town on January 1, 2005. The population of Town X on January 1, 2015, was 75 percent greater than the population of the same town on January 1, 2010. What was the population of Town X on January 1, 2005?

(1) The population of Town X on January 1, 2015, was 21,840.

(2) The increase in the population of Town X from January 1, 2010, to January 1, 2015, was 4,880 greater than the increase in the population of Town X from January 1, 2005, to January 1, 2010.



Let X be the population of town X on Jan 1 2005.

Hence population on Jan 1 2010 = 1.56X

& population on Jan 1 2015 = (1.56)(1.75)X



Statement 1: 21840 = (1.56)(1.75)X

We can find X. Statement 1 alone is Sufficient.


Statement 2: (1.56)(1.75)X - 1.56X = 1.56X - X + 4880

We can find X. Statement 2 alone is Sufficient.



Answer D.




Thanks,
GyM
_________________

New to GMAT Club - https://gmatclub.com/forum/new-to-gmat-club-need-help-271131.html#p2098335

GMAT Club Bot
Re: The population of Town X on January 1, 2010, was 56 percent greater... &nbs [#permalink] 09 Jul 2018, 02:07
Display posts from previous: Sort by

The population of Town X on January 1, 2010, was 56 percent greater...

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


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®.