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 →

list of 15 numbers

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
User avatar
Junior | Next Rank: 30 Posts
Posts: 13
Joined: Sun Mar 21, 2010 2:49 pm
Thanked: 2 times

by iamtensai » Mon Apr 19, 2010 7:13 pm
1. to get to the sum of 60, all 15 numbers could be equal (4), or they may vary (1, 4,4...4,3) => insufficient
2. this is sufficient on its own and it might help to break this down to a simpler case:
consider when you only have 4 numbers: a, b, c, d
if we know that the sum of any 3 numbers is 12, then we will get the equations
a+b+c =12
a+b +d =12
a +c+d=12
b+c+d=12

solve by subtracting any of the equations from each other and you will get a=b=c=d

the case with 15 numbers is just an extention with more variables.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 435
Joined: Mon Mar 15, 2010 6:15 amFollowed by: 1 member
Thanked: 32 times

by eaakbari » Thu Apr 22, 2010 2:04 am
(2) If any 3 numbers of a set can give you the same same, the numbers of the set are bound to be equal. Suff
(1) Insuff
Answer is B
Whether you think you can or can't, you're right.
- Henry Ford
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1