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

It is currently 15 Jul 2018, 14:24

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 X is divided by 7 the remainder is U, and when Y is

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
User avatar
Joined: 04 Jan 2008
Posts: 116
When X is divided by 7 the remainder is U, and when Y is [#permalink]

Show Tags

New post 12 Sep 2008, 06:34
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

HideShow timer Statistics

When X is divided by 7 the remainder is U, and when Y is divided by 7 the remainder is V. What is the value of U+V ?

(1) X+Y is divisible by 7
(2) X-Y is divisible by 7

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1733
Location: New York
Re: Zumit DS 018 [#permalink]

Show Tags

New post 12 Sep 2008, 22:10
dancinggeometry wrote:
When X is divided by 7 the remainder is U, and when Y is divided by 7 the remainder is V. What is the value of U+V ?

(1) X+Y is divisible by 7
(2) X-Y is divisible by 7


X= 7k+U
Y= 7m+V

1)
X+Y = 7 (k+m)+U+V
which is divisible by 7
means U+V must be divisable 7 and also U<7 and V<7
so U+V=7

Sufficient
2)

X-Y = 7(k-m)+(U-V)
This is divisible by 7 when U-V is also divisible by 7
and also U<7 and V<7..

U-V must be zero. i.e U=V

U can be any number between 1 to 7
insuffcient


A
_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1285
Re: Zumit DS 018 [#permalink]

Show Tags

New post 14 Sep 2008, 03:15
dancinggeometry wrote:
When X is divided by 7 the remainder is U, and when Y is divided by 7 the remainder is V. What is the value of U+V ?

(1) X+Y is divisible by 7
(2) X-Y is divisible by 7


say,X=7p+u
Y=7q+v
X+Y=7(p-q)+u+v
=> (1) u+v div by 7 => u+v=7
(2)u-v div by 7 => only when u=v then its possible hence multiple values

IMO A
_________________

cheers
Its Now Or Never

Director
Director
avatar
Joined: 29 Aug 2005
Posts: 817
Re: Zumit DS 018 [#permalink]

Show Tags

New post 24 Jan 2009, 13:28
x2suresh wrote:
dancinggeometry wrote:
When X is divided by 7 the remainder is U, and when Y is divided by 7 the remainder is V. What is the value of U+V ?

(1) X+Y is divisible by 7
(2) X-Y is divisible by 7


X= 7k+U
Y= 7m+V

1)
X+Y = 7 (k+m)+U+V
which is divisible by 7
means U+V must be divisable 7 and also U<7 and V<7
so U+V=7

Sufficient
2)

X-Y = 7(k-m)+(U-V)
This is divisible by 7 when U-V is also divisible by 7
and also U<7 and V<7..

U-V must be zero. i.e U=V

U can be any number between 1 to 7
insuffcient


A

I think, answer should be C.
If U and V each can be 0, neither of the statements by itself would be sufficient.
What do you think?
SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1733
Location: New York
Re: Zumit DS 018 [#permalink]

Show Tags

New post 24 Jan 2009, 13:59
botirvoy wrote:
x2suresh wrote:
dancinggeometry wrote:
When X is divided by 7 the remainder is U, and when Y is divided by 7 the remainder is V. What is the value of U+V ?

(1) X+Y is divisible by 7
(2) X-Y is divisible by 7


X= 7k+U
Y= 7m+V

1)
X+Y = 7 (k+m)+U+V
which is divisible by 7
means U+V must be divisable 7 and also U<7 and V<7
so U+V=7

Sufficient
2)

X-Y = 7(k-m)+(U-V)
This is divisible by 7 when U-V is also divisible by 7
and also U<7 and V<7..

U-V must be zero. i.e U=V

U can be any number between 1 to 7
insuffcient


A

I think, answer should be C.
If U and V each can be 0, neither of the statements by itself would be sufficient.
What do you think?


good point agreed.

when combined...

U=0 and V=0

U+V=0

C

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

Re: Zumit DS 018   [#permalink] 24 Jan 2009, 13:59
Display posts from previous: Sort by

When X is divided by 7 the remainder is U, and when Y is

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


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®.