It is currently 21 Feb 2018, 06:45

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

Events & Promotions in June
Open Detailed Calendar

A village is under attacked by a deadly virus species.

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

Hide Tags

2 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 10 Jul 2013
Posts: 324
A village is under attacked by a deadly virus species. [#permalink]

Show Tags

New post 05 Aug 2013, 00:08
2
This post received
KUDOS
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

49% (01:15) correct 51% (01:00) wrong based on 65 sessions

HideShow timer Statistics

A village is under attacked by a deadly virus species. The virus is spreading greatly. But there is a talented scientist who can put this virus under control, but to do so all he needs to know is “does the population of the viruses double everyday?”

(1) The population increased by 12 on a particular day.
(2) The population increased by 18 on a particular day.
[Reveal] Spoiler: OA

_________________

Asif vai.....


Last edited by Zarrolou on 05 Aug 2013, 00:14, edited 1 time in total.
Renamed the topic.
4 KUDOS received
Senior Manager
Senior Manager
avatar
B
Joined: 24 Aug 2009
Posts: 489
Schools: Harvard, Columbia, Stern, Booth, LSB,
Re: A village is under attacked by a deadly virus species....... [#permalink]

Show Tags

New post 05 Aug 2013, 00:27
4
This post received
KUDOS
Asifpirlo wrote:
A village is under attacked by a deadly virus species. The virus is spreading greatly. But there is a talented scientist who can put this virus under control, but to do so all he needs to know is “does the population of the viruses double everyday?”
(1) The population increased by 12 on a particular day.
(2) The population increased by 18 on a particular day.


Good Question

The questions asks whether "r " in a geometric sequence is 2 or not
Lets assume that r=2
& first term is x
So the sequence will be
x 2x 4x 8x 16x 32x 64x 128x
So the increases on any particular day can be x, 2x, 4x, 8x, 16x, 32x, 64x

Statement 1
The population increased by 12 on a particular day.
Clearly insufficient as 12 can equal any one of the terms in x, 2x, 4x, 8x, 16x, 32x, 64x

Statement 2
The population increased by 18 on a particular day.
Clearly insufficient as 18 can equal any one of the terms in x, 2x, 4x, 8x, 16x, 32x, 64x

Statement 1 & 2
The population increased by 12 & 18 on two different days.
12 can equal any one of the terms in the following sequence x, 2x, 4x, 8x, 16x, 32x, 64x
12......Value of x........Proportionate value of 18 (in terms of x)............Is there any increase in the sequence that equals Proportionate value of 18 (in terms of x)
x........12...................1.5x................................................................No
2x.......6....................3x...................................................................No
4x.......3....................6x...................................................................No
8x.......1.5.................12x..................................................................No
16x.....3/4.................24x..................................................................No

This clearly proves that "r " in a geometric sequence is not 2
Thus Sufficient

Answer C
_________________

If you like my Question/Explanation or the contribution, Kindly appreciate by pressing KUDOS.
Kudos always maximizes GMATCLUB worth
-Game Theory

If you have any question regarding my post, kindly pm me or else I won't be able to reply

1 KUDOS received
DS Forum Moderator
avatar
G
Joined: 21 Aug 2013
Posts: 792
Location: India
Premium Member CAT Tests
Re: A village is under attacked by a deadly virus species. [#permalink]

Show Tags

New post 17 Jan 2018, 10:13
1
This post received
KUDOS
Asifpirlo wrote:
A village is under attacked by a deadly virus species. The virus is spreading greatly. But there is a talented scientist who can put this virus under control, but to do so all he needs to know is “does the population of the viruses double everyday?”

(1) The population increased by 12 on a particular day.
(2) The population increased by 18 on a particular day.


Interesting Question!

(1) Population increased by 12 on a particular day. Clearly, this is insufficient to answer the question. Nothing about initial value of this day is given. And nothing about other days is given too. Insufficient.

(2) Population increased by 18 on a particular day. Again, this is also insufficient. Nothing about initial value of this day is given. And nothing about other days is given too. Insufficient.

Combining the two statements, on one particular day population increased by 12, and on another specific day it increased by 18. Now lets just Assume for a moment that the population is actually getting doubled every day. So on the day it increased by 12, the starting population must have been 12, and thus at the end of the day population must have become 24. So now, next day the population will increase by 24, making it 48 at the day end. Next day it will increase by 48 and so on.. Nowhere will it increase by 18 in this case (because if its actually getting doubled daily and it has increased by 12 on a particular day, then the next day's increase will be 24, and then the daily increase will keep on increasing).

So the assumption of daily getting doubled doesnt fit in here. If its getting doubled daily, then increase of both 12 (on some day) and 18 (on any other day) is NOT possible. So this gives us NO as an answer to the question. Sufficient.

Hence C answer
Re: A village is under attacked by a deadly virus species.   [#permalink] 17 Jan 2018, 10:13
Display posts from previous: Sort by

A village is under attacked by a deadly virus species.

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


GMAT Club MBA Forum Home| About| Terms and Conditions| 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®.