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

i falter in rate problems :( though being so easy

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 113
Joined: Mon Apr 26, 2010 8:58 amFollowed by: 14 members
Thanked: 2 times
by divya23 » Wed Jun 01, 2011 9:55 pm
6 machines,each wrking at same constant rate,together can complete a job in 12 days.How many additional machines,each woeking at the same rate will be needed to comp job in 8 days?
A.2
B.3
C.4
D.6
E.8

[spoiler]OA = C[/spoiler]
Top
Join the discussion
Source: — Problem Solving |
Legendary Member
Posts: 1309
Joined: Mon Apr 04, 2011 5:34 amFollowed by: 123 members
Location: India
Thanked: 310 times
GMAT Score:750

by cans » Wed Jun 01, 2011 10:24 pm
6 machines do work in 12 days
thus it means 1 machine alone can do work in 12*6 = 72 days
to complete work in 8 days, we need 72/8 = 9 machines
Thus additional of 9-6=3 machines.
IMO B
Top
Join the discussion
Legendary Member
Posts: 1448
Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members
Location: India
Thanked: 375 times

by Frankenstein » Thu Jun 02, 2011 1:01 am
Hi,
B seems to be correct. Can you check OA again.
Cheers!

Things are not what they appear to be... nor are they otherwise
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 407
Joined: Tue Jan 25, 2011 9:19 amFollowed by: 7 members
Thanked: 25 times

by Ozlemg » Thu Jun 02, 2011 1:09 am
B seems the right answer.

12 days --->6 machines
8 days---> x machines
-------------------------

There is an indirect propotion btw the number of machines and the days.SO,
12*6)/ 8 = 9 machines

9-6 : 3 additional machines are required.
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 113
Joined: Mon Apr 26, 2010 8:58 amFollowed by: 14 members
Thanked: 2 times

by divya23 » Thu Jun 02, 2011 1:29 am
ya its 3 sorry ppl
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 79
Joined: Mon Jan 17, 2011 4:51 amFollowed by: 5 members
Location: Hyderabad, India
Thanked: 8 times

by galaxian » Thu Jun 02, 2011 9:58 am
A Good way to approach these problems is to Calculate Amount of work done in Man-Days (Machine days)
Like : 9 Man can do in 7 days => 9*7 Man Days of Work
or 6 Machines in 5 Hours => 6*5 Machine Hours of total work has to be done, this makes finding the unknown easier !
divya23 wrote:6 machines,each wrking at same constant rate,together can complete a job in 12 days.How many additional machines,each woeking at the same rate will be needed to comp job in 8 days?
A.2
B.3
C.4
D.6
E.8

[spoiler]OA = C[/spoiler]
Top
Join the discussion