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

confusing question

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 21
Joined: Mon Nov 08, 2010 10:12 am
by rishi.riddle » Fri Nov 12, 2010 10:59 am
I have attached a question and in it ans is also there. But give the explanation
You do not have the required permissions to view the files attached to this post.
Top
Join the discussion
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 120
Joined: Thu Sep 02, 2010 8:56 am
Location: India
Thanked: 7 times
GMAT Score:730

by euro » Fri Nov 12, 2010 11:16 am
rishi.riddle wrote:I have attached a question and in it ans is also there. But give the explanation
Given that A, B, C and D are equally spaced.

Distance between D and C:
= D - C
= 5^13 - 5^12
= 5^12 (5-1)
= 4 x 5^12
This distance will remain constant between A & B and B & C.

Therefore value of A
= Value of C - 2 x [Distance]
= 5^12 - 2 [4 x 5^12]
= 5^12 - 8 x 5^12
= 5^12 (1 - 8)
= 5^12 (-7)

Correct Answer is D
Top
Join the discussion

GMAT/MBA Expert

GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Fri Nov 12, 2010 11:21 am
The integers A, B, C, and D shown on the number line above are all equally spaced. If C and D are equal to 5^12 and 5^13, respectively, what is the value of A?

Distance between C and D = 5^13 - 5^12 = (5^12)*(5 - 1) = 4*(5^12)
Distance between A and B = Distance between B and C = Distance between C and D = 4*(5^12)

Distance between A and D = Distance between A and B + Distance between B and C + Distance between C and D = 4*(5^12) + 4*(5^12) + 4*(5^12) = 3*4*(5^12) = 12*(5^12)

D = 5^13
Therefore, A = D - Distance between A and D = 5^13 - 12*(5^12) = (5^12)*(5 - 12) = (-7)*(5^12)

The correct answer is D.
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 21
Joined: Mon Nov 08, 2010 10:12 am

by rishi.riddle » Fri Nov 12, 2010 11:53 am
thkx rahul for good explanation........... the explanation i was looking for.......
Rahul@gurome wrote:The integers A, B, C, and D shown on the number line above are all equally spaced. If C and D are equal to 5^12 and 5^13, respectively, what is the value of A?

Distance between C and D = 5^13 - 5^12 = (5^12)*(5 - 1) = 4*(5^12)
Distance between A and B = Distance between B and C = Distance between C and D = 4*(5^12)

Distance between A and D = Distance between A and B + Distance between B and C + Distance between C and D = 4*(5^12) + 4*(5^12) + 4*(5^12) = 3*4*(5^12) = 12*(5^12)

D = 5^13
Therefore, A = D - Distance between A and D = 5^13 - 12*(5^12) = (5^12)*(5 - 12) = (-7)*(5^12)

The correct answer is D.
Top
Join the discussion