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

It is currently 21 Oct 2019, 00:46

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

Is rw = 0?

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

Hide Tags

Find Similar Topics 
Senior Manager
Senior Manager
User avatar
B
Joined: 10 Mar 2013
Posts: 465
Location: Germany
Concentration: Finance, Entrepreneurship
Schools: WHU MBA"20 (A)
GMAT 1: 580 Q46 V24
GPA: 3.88
WE: Information Technology (Consulting)
GMAT ToolKit User
Is rw = 0?  [#permalink]

Show Tags

New post Updated on: 19 Sep 2015, 14:51
4
13
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

92% (00:38) correct 8% (00:41) wrong based on 1359 sessions

HideShow timer Statistics

Is rw = 0?

(1) −6 < r < 5
(2) 6 < w < 10

Source: [OG 2016]

_________________
When you’re up, your friends know who you are. When you’re down, you know who your friends are.

Share some Kudos, if my posts help you. Thank you !

800Score ONLY QUANT CAT1 51, CAT2 50, CAT3 50
GMAT PREP 670
MGMAT CAT 630
KAPLAN CAT 660

Originally posted by BrainLab on 19 Sep 2015, 13:08.
Last edited by ENGRTOMBA2018 on 19 Sep 2015, 14:51, edited 1 time in total.
Edited the question and renamed the topic
CEO
CEO
avatar
S
Joined: 20 Mar 2014
Posts: 2596
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: Is rw = 0?  [#permalink]

Show Tags

New post 19 Sep 2015, 14:56
3
BrainLab wrote:
Is rw = 0?

(1) −6 < r < 5
(2) 6 < w < 10

Source: [OG 2016]


Is rw=0---> will be true if 1 of the r=0 or w=0 or r=w=0 is true.

Per statement 1, -6<r<5, you will get a "yes" with r=0 for all values of 'w' but a "no" with r=-4 and w=10. Thus not sufficient.

Per statement 2, 6<w<10, you will get a "yes" with r=0 for all values of 'w' but a "no" with r=-4 and w=8. Thus not sufficient.

Combining, -6<r<5 and 6<w<10, you get a "yes" if r=0 and w=7 but get a "no" for r=-4 and w=8. Thus still the statements are not sufficient.

E is thus the correct answer.
Intern
Intern
avatar
Joined: 06 Sep 2017
Posts: 1
Is rw = 0?  [#permalink]

Show Tags

New post 13 Oct 2017, 14:48
1
Statement 1 is telling us that r could be positive or negative (i.e. r could be -4 or 3) so we do not know what r equals
This is insufficient AND we do not know what w equals.

Statement 2 is telling us that w is a positive number between 6 and 10 (but w can't be 6 or 10!) so we do not know what w equals.
This is insufficient AND we do not know what r equals

Combining both statements still gives insufficient information so the answer is E. Since we are given only inequalities for r and w, then we cannot solve the equation. You could also think of it as: combining both statements we cannot definitively say what r and/or w equals so we cannot solve rw.
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 12 Sep 2015
Posts: 4015
Location: Canada
Re: Is rw = 0?  [#permalink]

Show Tags

New post 10 Jan 2018, 09:05
1
1
Top Contributor
1
BrainLab wrote:
Is rw = 0?

(1) −6 < r < 5
(2) 6 < w < 10


Target question: Is rw = 0?
Since each statement ALONE fails to provide information about both variables, let's jump straight to....

Statements 1 and 2 combined
There are several values of r and w that BOTH statements. Here are two:
Case a: r = 0 and w = 7, in which case rw = (0)(7) = 0
Case b: r = 1 and w = 7, in which case rw = (1)(7) = 7
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E

Cheers,
Brent
_________________
Test confidently with gmatprepnow.com
Image
Intern
Intern
avatar
B
Joined: 21 Feb 2019
Posts: 22
Re: Is rw = 0?  [#permalink]

Show Tags

New post 07 Jul 2019, 01:58
Hi - Apart from teh number substitution method, is this approach also correct -

-6 < r < 5 --------------- 1)
6 < w < 10 -------------- 2)

Multiplying 1& 2, we get -36 < rw < 50. Hence not sufficient.

Thanks,
Intern
Intern
avatar
B
Joined: 21 Jul 2018
Posts: 6
Re: Is rw = 0?  [#permalink]

Show Tags

New post 07 Jul 2019, 02:42
BrainLab wrote:
Is rw = 0?

(1) −6 < r < 5
(2) 6 < w < 10

Source: [OG 2016]



Case I- r can be any no. between -6 and 5. It can be 0 as well, so the answer to this is NOT SUFFICIENT

Case II- w can be anything but we cannot determine the value of r, which can be 0. So the ans is NOT SUFFICIENT

Combining 1&2, we still cannot determine because r can be 0 in this case as well.

So the answer is E
Intern
Intern
User avatar
S
Status: Classified
Joined: 19 Jun 2019
Posts: 32
Re: Is rw = 0?  [#permalink]

Show Tags

New post 20 Jul 2019, 11:54
kanikab wrote:
Hi - Apart from teh number substitution method, is this approach also correct -

-6 < r < 5 --------------- 1)
6 < w < 10 -------------- 2)

Multiplying 1& 2, we get -36 < rw < 50. Hence not sufficient.

Thanks,


kanikab, wouldn't suggest it as it's not intuitive.
Better to follow the order (i.e. check Statement (1), then Statement (2), so on) and insert values for the variables.

If the two statements are combined, \(-60 < rw < 50\).
Lower limit of \(rw\) would be \(-60\) and not \(-36\). (See? It isn't intuitive. You can get confused.)

Even if your resultant range of \(rw\) is considered, can't \(rw\) be \(0\) since \(0\) lies between \(-36\) and \(50\)?
_________________
Best
Palladin
SVP
SVP
User avatar
P
Joined: 03 Jun 2019
Posts: 1739
Location: India
Premium Member Reviews Badge CAT Tests
Re: Is rw = 0?  [#permalink]

Show Tags

New post 21 Jul 2019, 03:50
BrainLab wrote:
Is rw = 0?

(1) −6 < r < 5
(2) 6 < w < 10

Source: [OG 2016]


Asked: Is rw = 0?

(1) −6 < r < 5
If r=0 => rw=0 otherwise rw<>0
NOT SUFFICIENT

(2) 6 < w < 10
Since w<>0 => If r=0 => rw=0 otherwise rw<>0
NOT SUFFICIENT

Combing (1) & (2)
(1) −6 < r < 5
(2) 6 < w < 10
If r=0 => rw=0 otherwise rw<>0
NOT SUFFICIENT

IMO E
_________________
"Success is not final; failure is not fatal: It is the courage to continue that counts."

Please provide kudos if you like my post. Kudos encourage active discussions.

My GMAT Resources: -

Efficient Learning
All you need to know about GMAT quant

Tele: +91-11-40396815
Mobile : +91-9910661622
E-mail : kinshook.chaturvedi@gmail.com
GMAT Club Bot
Re: Is rw = 0?   [#permalink] 21 Jul 2019, 03:50
Display posts from previous: Sort by

Is rw = 0?

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





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