if x and y are integrs greater than 1, is x a multiple of y : DS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 22 Jan 2017, 04:25

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# if x and y are integrs greater than 1, is x a multiple of y

Author Message
Manager
Joined: 04 Feb 2004
Posts: 71
Location: India
Followers: 1

Kudos [?]: 25 [0], given: 0

if x and y are integrs greater than 1, is x a multiple of y [#permalink]

### Show Tags

15 Nov 2006, 00:45
00:00

Difficulty:

(N/A)

Question Stats:

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

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

if x and y are integrs greater than 1, is x a multiple of y ?

1) 3y^2 + 7y = x

2) x^2 - x is a multiple of y
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5062
Location: Singapore
Followers: 30

Kudos [?]: 358 [0], given: 0

### Show Tags

15 Nov 2006, 01:13
St1:
y(3y+7) = x

Since 3y+7 is an integer, then x is a multiple of y (3y+7)th multiple of y.

St2:
x(x-1) = yn where n is 1,2,3.. etc
Insufficient.

If x = 3, then x(x-1) = 6 while y could be 6. If so, then x is not a multiple of y. y could also be 2, then x is a multiple of y.

Ans A
Manager
Joined: 03 Jul 2005
Posts: 192
Location: City
Followers: 1

Kudos [?]: 10 [0], given: 0

### Show Tags

15 Nov 2006, 04:37
if x and y are integrs greater than 1, is x a multiple of y ?

1) 3y^2 + 7y = x
2) x^2 - x is a multiple of y

Question is asking is x/y = integer

x or y > 1

From A

Plugging number approach:

If Y = 3

3(9) + 21 =
27 + 21 = 48
Then X = 48 and 3 goes into 48 16 times

If y = 4
3(16) + 28 =
48 + 28 = 76
Then X = 76 and 4 gors into 76 = 19 times

From A we can work out that X is going to be a multiple of Y SUFF

From B

Same reason as ywilfred, plug in the numbers to test INSUFF

A is what I would pick.

What is OA?
Manager
Joined: 29 Aug 2006
Posts: 157
Followers: 1

Kudos [?]: 6 [0], given: 0

Re: DS: multiple - GMAT PREP [#permalink]

### Show Tags

15 Nov 2006, 09:50
ak_idc wrote:
deep wrote:
if x and y are integrs greater than 1, is x a multiple of y ?

1) 3y^2 + 7y = x

y(3y+7) = x

x is a multiple of y.

2) x^2 - x is a multiple of y

x(x-1) = y

y is a multiple of x.

We can then say x is not a multiple of y.

Hi AK,
If x is a multiple of y, then x/y has to be an integer.
In the second case, x(x-1)=cy where c is a constant.
x/y can be a integer only if c/x-1 is an integer, which we cannot decide.
Hence S2 shud be insuff.
Re: DS: multiple - GMAT PREP   [#permalink] 15 Nov 2006, 09:50
Display posts from previous: Sort by