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

circular gears

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 69
Joined: Fri Jun 19, 2009 11:46 am
Location: London
Thanked: 1 times
by LevelOne » Fri Jul 03, 2009 1:06 pm
1) Circular gears P and Q start rotating at the same time at constant speeds. Gear P makes 10 revolutions per minute, and gear Q makes 40 revolutions per minute. How many seconds after the gears start rotating will gear Q have made exactly 6 more revolutions than gear P?

A. 6
B. 8
C. 10
D. 12
E. 15

2) The value of 10^8 - 10^2/10^7 - 10^3 is closest to which of the following?

A. 1
B. 10
C. 10^2
D. 10^3
E. 10^4

thanks
Top
Join the discussion
Source: — Problem Solving |
Legendary Member
Posts: 1161
Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member
Location: Sydney
Thanked: 23 times

by mehravikas » Fri Jul 03, 2009 8:21 pm
Answer to Question 1 -

P = 10 rev per minute -> in one second it makes 10/60 = 1/6 rev per sec
Q = 40 rev per min -> in 1 sec = 40/60 = 2/3 rev per sec

1/6 * t + 6 = 2/3 * t

solve for t and you'll get 12. Answer D
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 69
Joined: Fri Jun 19, 2009 11:46 am
Location: London
Thanked: 1 times

by LevelOne » Fri Jul 03, 2009 10:37 pm
OA is D. how about exponents in (2)?
Top
Join the discussion
Legendary Member
Posts: 575
Joined: Tue Nov 04, 2008 2:58 amFollowed by: 4 members
Location: India
Thanked: 18 times
GMAT Score:710

by rahulg83 » Sat Jul 04, 2009 5:19 am
2) The value of 10^8 - 10^2/10^7 - 10^3 is closest to which of the following?

A. 1
B. 10
C. 10^2
D. 10^3
E. 10^4
i suppose question asks for value of (10^8 - 10^2)/(10^7 - 10^3), it can be written as 10^2{(10^6)-1}/10^3{(10^4)-1}, now 1 can be neglected in comparison with 10^6 or 10^4

So our expression will now reduce to (10^2*10^6)/(10^3*10^4)=10 ans..
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 69
Joined: Fri Jun 19, 2009 11:46 am
Location: London
Thanked: 1 times

by LevelOne » Sat Jul 04, 2009 5:31 am
rahulg83, thanks again.
Top
Join the discussion
Legendary Member
Posts: 1161
Joined: Mon May 12, 2008 2:52 amFollowed by: 1 member
Location: Sydney
Thanked: 23 times

by mehravikas » Sun Jul 05, 2009 1:45 pm
Rahul,

can you explain how can you neglect 1 please?

Thanks,
Vikas
rahulg83 wrote:
2) The value of 10^8 - 10^2/10^7 - 10^3 is closest to which of the following?

A. 1
B. 10
C. 10^2
D. 10^3
E. 10^4
i suppose question asks for value of (10^8 - 10^2)/(10^7 - 10^3), it can be written as 10^2{(10^6)-1}/10^3{(10^4)-1}, now 1 can be neglected in comparison with 10^6 or 10^4

So our expression will now reduce to (10^2*10^6)/(10^3*10^4)=10 ans..
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 24
Joined: Mon May 19, 2008 3:48 pm

by kath_the_great4 » Sun Jul 05, 2009 7:15 pm
1 is insignificant when you are dealing with numbers in the thousands...we are not looking for an exact response here.
Top
Join the discussion