BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Multiples A

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
Posts: 27
Joined: Tue Sep 04, 2007 2:29 pm

TT

by TT » Mon Sep 10, 2007 3:29 pm
I think the answer is A.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 258
Joined: Mon Aug 27, 2007 12:43 pm
Thanked: 15 times

by ri2007 » Mon Sep 10, 2007 7:15 pm
Agree ans should be A

Stat 1) 3y^2+7y = x

3y^ is a multiple of Y, also 7 Y is a multiple of Y so the sum of the two will be a multiple of Y. Since Multiple of Y is = X ans should be yes.

You can plug in diff values and check.

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

Since x^2 - x can be greater than greater than X you cannot determine if X is also a multiple

I have a feeling I have not been able to explain this one properly. Hope it helps ????
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 460
Joined: Sun Mar 25, 2007 7:42 am
Thanked: 27 times

by samirpandeyit62 » Mon Sep 10, 2007 8:52 pm
Stat 1: 3y^2+7y = x

i.e y(3y+7) =x

so x is a multiple of y

stmt 2: x^2 - x is a multiple of y

so x(x-1) is a multiple of y

so y is a factor of x(x-1)

now we cannot say that x is a multiple of y i.e here x may be a multiple of y or it may be x-1

So ans should be A
Regards
Samir
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 194
Joined: Thu Jan 14, 2010 5:18 am
Thanked: 2 times

by girish3131 » Mon Mar 15, 2010 12:13 am
I perfectly agree with th eexplanation that B is not sufficient from yr perspective...

now jus take this in this way ->

x(x-1)/y = k where k is an integer

now x/y = k / (x-1)

now x > 1(given) so take any value for x let say 5

x/y = 4k ie an integer...

so in this way we can say that y is an factor of x

hence B too sufficient....



wat u say..
Last edited by girish3131 on Mon Mar 15, 2010 12:36 am, edited 1 time in total.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2326
Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members
Thanked: 173 times
GMAT Score:710

by gmatmachoman » Mon Mar 15, 2010 12:15 am
samirpandeyit62 wrote:Stat 1: 3y^2+7y = x

i.e y(3y+7) =x

so x is a multiple of y

stmt 2: x^2 - x is a multiple of y

so x(x-1) is a multiple of y

so y is a factor of x(x-1)

now we cannot say that x is a multiple of y i.e here x may be a multiple of y or it may be x-1

So ans should be A
good explanation.
St 1: we can clearly say X is a mulitple of Y.(i.e y(3y+7) =x )

St 2: It can be that X or (X-1) can be the multiple of Y.So Insufficient

IMO A
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 194
Joined: Thu Jan 14, 2010 5:18 am
Thanked: 2 times

by girish3131 » Mon Mar 15, 2010 12:18 am
no no...

my point is that B too suffiecient irrespective any value of X
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2326
Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members
Thanked: 173 times
GMAT Score:710

by gmatmachoman » Mon Mar 15, 2010 12:49 am
girish3131 wrote:no no...

my point is that B too suffiecient irrespective any value of X
How come?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 610
Joined: Fri Jan 15, 2010 12:33 amFollowed by: 2 members
Thanked: 47 times

by kstv » Mon Mar 15, 2010 12:55 am
x and y are integers greater than 1, is x a multiple of y ?
can be express x = ky where k can be any constant
1) 3y²+7y = x y(3y+7) = x
means y multiplied by (3y+7) = x let (3y+7) = k as k can be any constant
yk = x Suff.
2) x²-x is a multiple of y
so x(x-1) = ky where k can be any constant
x = k/(x-1) *y as x > 1 ( all the while u wonder why this fact was mentioned.)
k / (x-1) will not always be an integer.
if it was given x < 1 eg. 1/2 then k/(x-1) = 2k then x= 2k.y then Suff
but now it's Insufficient.

IMO A
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 194
Joined: Thu Jan 14, 2010 5:18 am
Thanked: 2 times

by girish3131 » Mon Mar 15, 2010 1:11 am
kstv wrote:x and y are integers greater than 1, is x a multiple of y ?
can be express x = ky where k can be any constant
1) 3y²+7y = x y(3y+7) = x
means y multiplied by (3y+7) = x let (3y+7) = k as k can be any constant
yk = x Suff.
2) x²-x is a multiple of y
so x(x-1) = ky where k can be any constant
x = k/(x-1) *y as x > 1 ( all the while u wonder why this fact was mentioned.)
k / (x-1) will not always be an integer.
if it was given x < 1 eg. 1/2 then k/(x-1) = 2k then x= 2k.y then Suff
but now it's Insufficient.

IMO A
KSTV

acc to u , for which value of x , k / (x-1) is not an integer ?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 610
Joined: Fri Jan 15, 2010 12:33 amFollowed by: 2 members
Thanked: 47 times

by kstv » Tue Mar 16, 2010 10:40 pm
girish3131 wrote:
kstv wrote:x and y are integers greater than 1, is x a multiple of y ?
Is the assumption I am making too sweeping
please point out the flaw .
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1