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

It is currently 25 Sep 2018, 08:18

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

If the GMATCLUB timer, which is absolutely correct, shows 20% correct

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

Hide Tags

Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 6810
If the GMATCLUB timer, which is absolutely correct, shows 20% correct  [#permalink]

Show Tags

New post 31 Jan 2017, 03:43
1
2
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

87% (01:37) correct 13% (01:19) wrong based on 57 sessions

HideShow timer Statistics

If the GMATCLUB timer, which is absolutely correct, shows 20% correct answers, what can be the number of incorrect answers?

1) 4
2) 6
3) 14
4) 25
5) 30

Self made

_________________

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

Senior SC Moderator
User avatar
V
Joined: 14 Nov 2016
Posts: 1321
Location: Malaysia
GMAT ToolKit User Premium Member CAT Tests
Re: If the GMATCLUB timer, which is absolutely correct, shows 20% correct  [#permalink]

Show Tags

New post 31 Jan 2017, 03:47
1
A. 0.8 x = 4, x = 5. Others answer choice is not divisible by 0.8.


Sent from my iPhone using GMAT Club Forum mobile app
_________________

"Be challenged at EVERY MOMENT."

“Strength doesn’t come from what you can do. It comes from overcoming the things you once thought you couldn’t.”

"Each stage of the journey is crucial to attaining new heights of knowledge."

Rules for posting in verbal forum | Please DO NOT post short answer in your post!

Advanced Search : https://gmatclub.com/forum/advanced-search/

CEO
CEO
User avatar
D
Joined: 12 Sep 2015
Posts: 2904
Location: Canada
Re: If the GMATCLUB timer, which is absolutely correct, shows 20% correct  [#permalink]

Show Tags

New post 31 Jan 2017, 07:58
Top Contributor
chetan2u wrote:
If the GMATCLUB timer, which is absolutely correct, shows 20% correct answers, what can be the number of incorrect answers?
1) 4
2) 6
3) 14
4) 25
5) 30

Self made


Let C = # of correct responses
Let N = # of NOT correct (incorrect) responses
So, C+N = TOTAL # of responses

We're told that (# of correct responses)/(TOTAL # of responses) = 20%
In other words, (# of correct responses)/(TOTAL # of responses) = 1/5
So, C/(C + N) = 1/5
Cross multiply to get: 5C = 1(C + N)
Simplify: 5C = C + N
Subtract C from both sides: 4C = N
We can see that N is 4 TIMES the value of C
In other words, N is a multiple of 4

Check the answer choices....
Only answer choice A is a multiple of 4

Answer: A
_________________

Brent Hanneson – GMATPrepNow.com
Image
Sign up for our free Question of the Day emails

Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4033
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User Premium Member
Re: If the GMATCLUB timer, which is absolutely correct, shows 20% correct  [#permalink]

Show Tags

New post 31 Jan 2017, 08:46
chetan2u wrote:
If the GMATCLUB timer, which is absolutely correct, shows 20% correct answers, what can be the number of incorrect answers?
1) 4
2) 6
3) 14
4) 25
5) 30

Self made

Correct = 0.20 ; Incorrect = 0.80

Thus, the answer must be divisible by 8

Among the given options only (A) is possible...

So, Correct Answer must be (A)
_________________

Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )

CEO
CEO
User avatar
D
Joined: 12 Sep 2015
Posts: 2904
Location: Canada
Re: If the GMATCLUB timer, which is absolutely correct, shows 20% correct  [#permalink]

Show Tags

New post 31 Jan 2017, 08:50
Top Contributor
Abhishek009 wrote:

Thus, the answer must be divisible by 8

Among the given options only (A) is possible...



Be careful; 4 is not divisible by 8.

Cheers,
Brent
_________________

Brent Hanneson – GMATPrepNow.com
Image
Sign up for our free Question of the Day emails

Manager
Manager
avatar
S
Joined: 21 Jan 2016
Posts: 81
Location: India
GMAT 1: 670 Q50 V30
WE: Engineering (Computer Software)
Re: If the GMATCLUB timer, which is absolutely correct, shows 20% correct  [#permalink]

Show Tags

New post 31 Jan 2017, 09:25
Let A be total answers. Wrong question is 0.8A. This should be integer. Only 4 satisfies
Manager
Manager
avatar
S
Joined: 03 Jan 2017
Posts: 170
Re: If the GMATCLUB timer, which is absolutely correct, shows 20% correct  [#permalink]

Show Tags

New post 12 Mar 2017, 08:18
Question tests divisibility:

0,8x= one of the answer choices

I tried to apply ratios: 4:1
the only one answer that fit was 4, hence A is correct
GMAT Club Bot
Re: If the GMATCLUB timer, which is absolutely correct, shows 20% correct &nbs [#permalink] 12 Mar 2017, 08:18
Display posts from previous: Sort by

If the GMATCLUB timer, which is absolutely correct, shows 20% correct

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

Events & Promotions

PREV
NEXT


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®.