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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
Vote for Target Test Prep, Newsweek Readers’ Choice Awards 2026
NEWSWEEK READERS’ CHOICE 2026

BIG NEWS! Target Test Prep has been nominated, and they’d love your vote!

TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.

Vote for TTP
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

collection of tough problems from G PREP - 27

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 379
Joined: Tue Sep 30, 2008 7:17 amFollowed by: 11 members
Location: NY
Thanked: 28 times
by abhasjha » Mon Feb 08, 2010 3:14 am
Are all of the numbers in a certain list of 15 numbers equal?

(1) The sum of all the numbers in the list is 60.

(2) The sum of any 3 numbers in the list is 12.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1022
Joined: Mon Jul 20, 2009 11:49 pmFollowed by: 2 members
Location: Gandhinagar
Thanked: 41 times

by shashank.ism » Mon Feb 08, 2010 3:54 am
abhasjha wrote:Are all of the numbers in a certain list of 15 numbers equal?

(1) The sum of all the numbers in the list is 60.

(2) The sum of any 3 numbers in the list is 12.
statement 1: 60 = 15* 4 so either all numbers are 4 but their can be other numbers like 3+5= 4+4 etc. ...insufficient
statement 2: 12 =3* 4 .. so but these 3 nos can be arranged among themselves like 2+3 +7 = 4+4+4 etc. ---- insufficient.

combined... a group of 3 can be arranged similarly among 60 numbers since 60 is divisible by 5..
so again insufficient
hence ans is E
My Websites:
www.mba.webmaggu.com - India's social Network for MBA Aspirants

www.deal.webmaggu.com -India's online discount, coupon, free stuff informer.

www.dictionary.webmaggu.com - A compact free online dictionary with images.

Nothing is Impossible, even Impossible says I'm possible.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 2623
Joined: Mon Jun 02, 2008 3:17 amFollowed by: 355 members
Location: Montreal
Thanked: 1090 times
GMAT Score:780

by Ian Stewart » Mon Feb 08, 2010 1:37 pm
abhasjha wrote:Are all of the numbers in a certain list of 15 numbers equal?

(1) The sum of all the numbers in the list is 60.

(2) The sum of any 3 numbers in the list is 12.
Statement 1 is clearly not sufficient.

Statement 2: Say we have the numbers a, b, c, and x in our list. We know from S2:

a + b + c = 12
x + b + c = 12

Subtract the second equation from the first and you find that a = x. Since I can prove that for any two numbers in the list in the same way (there's nothing special about a and x here), all the numbers in the list must be equal (they all must be 4), and Statement 2 is sufficient.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Community Manager
Posts: 1537
Joined: Mon Aug 10, 2009 6:10 pmFollowed by: 252 members
Thanked: 653 times

by papgust » Mon Feb 08, 2010 9:05 pm
Ian Stewart wrote:Statement 2: Say we have the numbers a, b, c, and x in our list. We know from S2:

a + b + c = 12
x + b + c = 12

Subtract the second equation from the first and you find that a = x. Since I can prove that for any two numbers in the list in the same way (there's nothing special about a and x here), all the numbers in the list must be equal (they all must be 4), and Statement 2 is sufficient.
Ian,

I couldn't get your Statement II logic. Can you pls explain a bit more?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1132
Joined: Mon Jul 20, 2009 3:38 amFollowed by: 6 members
Location: India
Thanked: 64 times
GMAT Score:760

by harsh.champ » Mon Feb 08, 2010 11:43 pm
papgust wrote:
Ian Stewart wrote:Statement 2: Say we have the numbers a, b, c, and x in our list. We know from S2:

a + b + c = 12
x + b + c = 12

Subtract the second equation from the first and you find that a = x. Since I can prove that for any two numbers in the list in the same way (there's nothing special about a and x here), all the numbers in the list must be equal (they all must be 4), and Statement 2 is sufficient.
Ian,

I couldn't get your Statement II logic. Can you pls explain a bit more?
Well,
In statement 2 it is given that the sum of 3 no.s is 12,
so a+b+c=12 as well as x+b+c =12
WHICH IS ONLY POSSIBLE WHEN A=X.
So,it can be proved that all the no.s are equal and their value = 4.

Hence,statement 2 is sufficient.
I hope you get it now.:)
It takes time and effort to explain, so if my comment helped you please press Thanks button :)



Just because something is hard doesn't mean you shouldn't try,it means you should just try harder.

"Keep Walking" - Johnny Walker :P
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1