Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
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.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
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 Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart 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 563 reviewsTarget Test Prep

In the triangle ABC, which of the following must be true ?

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
User avatar
Master | Next Rank: 500 Posts
Posts: 421
Joined: Sun Apr 17, 2011 4:27 amFollowed by: 2 members
Location: India
Thanked: 6 times
GMAT Score:620
by vinni.k » Thu May 09, 2013 12:18 am
In the triangle ABC, which of the following must be true ?

I. x > 50
II. AC < 10
III. AB > 10

A. I only
B. III only
C. I and II only
D. I and III only
E. I, II, and III

Answer is C

Please explain.

Thanks & Regards
Vinni
You do not have the required permissions to view the files attached to this post.
Top
Join the discussion
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 149
Joined: Wed May 01, 2013 10:37 pmFollowed by: 9 members
Thanked: 54 times

by Atekihcan » Thu May 09, 2013 1:44 am
(x + x + (x - 15)) = 180 ---> 3x = 195 --> x = 65
So, clearly I is true.

Now, BC = 10 and it's opposite angle measures 65 degrees.
Opposite angle of AC measures (65 - 15) = 50 degrees.
So, AC must be less than BC.
So, II is also true.

And, AB = BC = 10
So, clearly III is not true.

Answer : C
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 447
Joined: Sun Apr 22, 2012 7:13 amFollowed by: 13 members
Thanked: 46 times
GMAT Score:700

by hemant_rajput » Thu May 09, 2013 3:00 am
vinni.k wrote:In the triangle ABC, which of the following must be true ?

I. x > 50
II. AC < 10
III. AB > 10

A. I only
B. III only
C. I and II only
D. I and III only
E. I, II, and III

Answer is C

Please explain.

Thanks & Regards
Vinni

3x - 15 = 180 ( sum of angle of triangle)

x = 65.

so 1 is true.
now ac is opposite to angle x -15 so it will be less than the side opp to angle x, which is having length of 10.
so 2 is also true.
now ab = bc = 10( isosceles triangle)
so 3 is definitely not true.

answer is c.
I'm no expert, just trying to work on my skills. If I've made any mistakes please bear with me.
Top
Join the discussion