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

Powers

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times
by vishubn » Thu Oct 02, 2008 10:15 pm
(0.8)-5 / (0.4)-4 =
A. 3/32
B. 5/64
C. 1/2
D. 1
E. 2

i solved til lend but not able to relate it to the answer choices

vishu
Top
Join the discussion
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Thu Oct 02, 2008 10:19 pm
(0.8)-5 / (0.4)-4

-4.2 / -3.6

4.2/3.6 = 42/36 = 7/6

Am I missing something in understanding the Q?
Top
Join the discussion
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times

by vishubn » Thu Oct 02, 2008 10:35 pm
i got he answer has 1/12.8

so i am sure it should be either A/B and the OA is B

and also out of curioisty i used a calculator to
the dvision of 5/64 and 1/12.8 and it is indeed true

but i dont know how to deduce in the form of answer chocies !!

Vishu
Top
Join the discussion
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Thu Oct 02, 2008 10:37 pm
What am i missing?
i mean whats wrong in my explanation??


1/12.8
= 10/128 [remove decimal]
= 5/64
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 316
Joined: Mon Sep 22, 2008 12:04 amFollowed by: 1 member
Thanked: 36 times

Re: Powers

by Morgoth » Thu Oct 02, 2008 11:37 pm
vishubn wrote:(0.8)-5 / (0.4)-4 =
A. 3/32
B. 5/64
C. 1/2
D. 1
E. 2

i solved til lend but not able to relate it to the answer choices

vishu
(0.8)-5 / (0.4)-4

(0.8)-5 = 1/0.8^5 = 1/ (8/10)^5

(0.4)-4 = 1/0.4^4 = 1/(4/10)^4

1/ (8/10)^5 / 1/(4/10)^4 = (4/10)^4 / (8/10)^5

4^4 / 1 / (8)^5 / 10 = 10/(2^4 * 8) = 10/ (16*8) = 10/128 = 5/64.

Hope this helps.
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 316
Joined: Mon Sep 22, 2008 12:04 amFollowed by: 1 member
Thanked: 36 times

by Morgoth » Thu Oct 02, 2008 11:41 pm
stop@800 wrote:(0.8)-5 / (0.4)-4

-4.2 / -3.6

4.2/3.6 = 42/36 = 7/6

Am I missing something in understanding the Q?
I am not able to understand what have you done here.

0.8^-5 = 1/0.8^5 how this can be -4.2. no sure.
Top
Join the discussion
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Thu Oct 02, 2008 11:45 pm
Morgoth wrote:
stop@800 wrote:(0.8)-5 / (0.4)-4

-4.2 / -3.6

4.2/3.6 = 42/36 = 7/6

Am I missing something in understanding the Q?
I am not able to understand what have you done here.

0.8^-5 = 1/0.8^5 how this can be -4.2. no sure.
I misunderstood power.
As "^" was missing so I took it as just a subtraction :(

So stupid mistake :)
Top
Join the discussion
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times

by vishubn » Fri Oct 03, 2008 6:02 am
Oh man !@@ i think my brains are blowing out ! sushc a stupid mistake i did !!

Stop@8000 thansk again !!

Vishu
Top
Join the discussion