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

It is currently 09 Dec 2019, 19:39

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

When 100 mice were injected with a certain chemical, some de

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

Hide Tags

Find Similar Topics 
Manager
Manager
avatar
Joined: 08 Dec 2012
Posts: 61
Location: United Kingdom
WE: Engineering (Consulting)
When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post Updated on: 16 Aug 2013, 14:18
3
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

60% (01:23) correct 40% (01:18) wrong based on 181 sessions

HideShow timer Statistics

When 100 mice were injected with a certain chemical, some developed inflammation at the site of the injection and some developed the condition of nausea. How many of the mice developed inflammation but not nausea?

(1) 88 mice developed neither inflammation nor nausea.

(2) 2 mice developed nausea.



Not sure about the OA though, what about the option of 12 mice having inflammation with 2 having nausea as well? Would we have to assume there is no overlap when it is not explicitly stated?

Originally posted by nave on 11 Aug 2013, 11:03.
Last edited by nave on 16 Aug 2013, 14:18, edited 1 time in total.
Manager
Manager
avatar
Joined: 27 Feb 2012
Posts: 111
Re: When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 11 Aug 2013, 11:51
nave81 wrote:
When 100 mice were injected with a certain chemical, some developed inflammation at the site of the injection and some developed the condition of nausea. How many of the mice developed inflammation but not nausea?

(1) 88 mice developed neither inflammation nor nausea.

(2) 2 mice developed nausea.


Should be C.
On Combining we wil have I not N.
Two by two matrix will get you there.
Manager
Manager
User avatar
Joined: 08 Nov 2014
Posts: 75
Location: India
GPA: 3
WE: Engineering (Manufacturing)
GMAT ToolKit User
Re: When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 14 Apr 2015, 11:32
Assume :
Only Inflammation = I
Only Nausea = N
Both = B
None = 88
Total=100
1)
I+N+B=100-88=12................. Insufficient

2)
N+B=2 ........................ Insufficient

Combining 1 & 2 , I=10



nave wrote:
When 100 mice were injected with a certain chemical, some developed inflammation at the site of the injection and some developed the condition of nausea. How many of the mice developed inflammation but not nausea?

(1) 88 mice developed neither inflammation nor nausea.

(2) 2 mice developed nausea.



Not sure about the OA though, what about the option of 12 mice having inflammation with 2 having nausea as well? Would we have to assume there is no overlap when it is not explicitly stated?

_________________
"Arise, Awake and Stop not till the goal is reached"
Intern
Intern
avatar
Joined: 17 May 2015
Posts: 14
Reviews Badge
Re: When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 13 Jul 2015, 16:17
Hi all,

I'm getting E on this one. How do we know there is no overlap? Thanks!
CEO
CEO
avatar
S
Joined: 20 Mar 2014
Posts: 2560
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE: Engineering (Aerospace and Defense)
GMAT ToolKit User Reviews Badge
When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 13 Jul 2015, 16:38
4
warnimont wrote:
Hi all,

I'm getting E on this one. How do we know there is no overlap? Thanks!


Even without the information about the overlap, we can calculate how many mice had inflammation with no nausea. Refer to the following solution.

The easiest way to solve this is by 2X2 matrix method (Attached Figure 1):

Figure 1 shows the given information. X= number of mice with inflammation but not nausea.

Per statement 1 (figure 2), We get x+y+88=100 but no other information and we have 2 variables with 1 equation ----> not sufficient.

Per statement 2 (figure 3), We get total nausea cases = 2 ----> Total 'not nausea' cases = 100-2 = 98, but without any other information, we wont be able to calculate x. Thus this statement is still insufficient.

Combining, we see x+88 = 98 ----> x =10. Thus combined , both statements are sufficient. Thus C is the correct answer.

I have also attached venn diagram approach for the same question (with a= inflammation only, b = inflammation and nausea, c =nausea only, d = neither inflammation nor nausea)

Hope this helps. Sometimes, DS questions give you values of lets say b+c instead of just b. But for us getting b+c is lot more beneficial to get the value of 'a'. Thus although it would look like it is not sufficient but on a deeper analysis of the question, it will become quite evident that you actually have all the information to answer the questions.
Attachments

Venn Diagram Approach.jpg
Venn Diagram Approach.jpg [ 78.33 KiB | Viewed 1486 times ]

2X2 Matrix Approach.jpg
2X2 Matrix Approach.jpg [ 77.49 KiB | Viewed 1486 times ]

Intern
Intern
avatar
Joined: 17 May 2015
Posts: 14
Reviews Badge
Re: When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 13 Jul 2015, 19:07
I see it now. Crystal clear. Thank you very much!
Intern
Intern
avatar
Joined: 21 Mar 2014
Posts: 21
Re: When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 07 Sep 2015, 14:48
can some one please explain this with a matrix table
_________________
kinaare paaon phailane lage hian,
nadi se roz mitti kat rahi hai....
CEO
CEO
avatar
S
Joined: 20 Mar 2014
Posts: 2560
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE: Engineering (Aerospace and Defense)
GMAT ToolKit User Reviews Badge
Re: When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 07 Sep 2015, 14:54
saroshgilani wrote:
can some one please explain this with a matrix table


Refer to when-100-mice-were-injected-with-a-certain-chemical-some-de-157723.html#p1548774 , refer to 2nd attached figure that solves it by the matrix method.
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13731
Re: When 100 mice were injected with a certain chemical, some de  [#permalink]

Show Tags

New post 26 Nov 2019, 23:50
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: When 100 mice were injected with a certain chemical, some de   [#permalink] 26 Nov 2019, 23:50
Display posts from previous: Sort by

When 100 mice were injected with a certain chemical, some de

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





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