BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

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.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 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
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
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
GMATOnDemand Start 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 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Good Word-Prob ->>Satellite modular units!

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 516
Joined: Fri Jul 31, 2009 3:22 pmFollowed by: 13 members
Thanked: 112 times
by smackmartine » Mon Aug 22, 2011 10:16 pm
A satellite is composed of 30 modular units, each of which is equipped with a set of sensors, some of which have been upgraded. Each unit contains the same number of non-upgraded sensors. If the number of non-upgraded sensors on one unit is 1/5 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?

A) 5/6
B)1/5
C)1/6
D)1/7
E)1/24

OA after some discussion.
Smack is Back ...
It takes time and effort to explain, so if my comment helped you please press Thanks button :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members
Location: Milpitas, CA
Thanked: 1854 times
GMAT Score:770

by Anurag@Gurome » Mon Aug 22, 2011 10:29 pm
smackmartine wrote:A satellite is composed of 30 modular units, each of which is equipped with a set of sensors, some of which have been upgraded. Each unit contains the same number of non-upgraded sensors. If the number of non-upgraded sensors on one unit is 1/5 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?
Say, total number of upgraded sensor in the satellite is x.

Hence, number of non-upgraded sensors in each unit = 1/5 of x = x/5
Hence, number of non-upgraded sensors in the satellite, i.e. 30 units = 30*(x/5) = 6x

Hence, the required fraction = (Number of upgraded sensors)/(Total number of sensors) = x/(x + 6x) = 1/7

The correct answer is D.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 516
Joined: Fri Jul 31, 2009 3:22 pmFollowed by: 13 members
Thanked: 112 times

by smackmartine » Mon Aug 22, 2011 10:35 pm
Thanks Anurag, for the shorter/alternate method.OE seems to be longer than your explanation . Thanks again.

OA D
Smack is Back ...
It takes time and effort to explain, so if my comment helped you please press Thanks button :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members
Location: New York, NY
Thanked: 13060 times
GMAT Score:790

by GMATGuruNY » Tue Aug 23, 2011 2:56 am
smackmartine wrote:A satellite is composed of 30 modular units, each of which is equipped with a set of sensors, some of which have been upgraded. Each unit contains the same number of non-upgraded sensors. If the number of non-upgraded sensors on one unit is 1/5 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?

A) 5/6
B)1/5
C)1/6
D)1/7
E)1/24

OA after some discussion.
Let the TOTAL number of upgraded sensors = 5.
Then the number of non-upgraded sensors on EACH unit = (1/5)*5 = 1.
Thus, the TOTAL number of non-upgraded sensors on the 30 units = 30*1 = 30.
Upgraded/(Upgraded+Non-upgraded) = 5/(5+30) = 1/7.

The correct answer is D.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 582
Joined: Tue Mar 08, 2011 12:48 amFollowed by: 6 members
Thanked: 61 times
GMAT Score:740

by force5 » Tue Aug 23, 2011 5:14 am
yes got 1/7 too
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 516
Joined: Fri Jul 31, 2009 3:22 pmFollowed by: 13 members
Thanked: 112 times

by smackmartine » Tue Aug 23, 2011 7:44 am
Thanks Mitch!

#s are your slaves.
Smack is Back ...
It takes time and effort to explain, so if my comment helped you please press Thanks button :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 608
Joined: Sun Jun 19, 2011 11:16 amFollowed by: 8 members
Thanked: 37 times

by saketk » Tue Aug 23, 2011 9:39 pm
smackmartine wrote:A satellite is composed of 30 modular units, each of which is equipped with a set of sensors, some of which have been upgraded. Each unit contains the same number of non-upgraded sensors. If the number of non-upgraded sensors on one unit is 1/5 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?

A) 5/6
B)1/5
C)1/6
D)1/7
E)1/24

OA after some discussion.
--- I think this one is from one of the Manhattan tests. I agree with you, OE seems to be long and confusing.

Just choose numbers and do the question.. Total upgraded 5/unit. So total not-upgraded sensor =1
No. of unit =30. This gives us the total of 30 units (non-upgraded) = 30
So our answer will be
5/(5+30) = 1/7
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 60
Joined: Thu Sep 24, 2009 2:38 pmFollowed by: 9 members
Location: NYC
Thanked: 33 times
GMAT Score:710

by benjiboo » Sun Sep 16, 2012 5:43 pm
The explanation by MGMAT was quite confusing. There was no need for two variables. A little reasoning through these type of problems makes them go from level 700 to level 500. Here was my thought process. (I am sleepy, so I hope I typed this all in right).

-Might need to download picture to see it full sized.
Attachments
Slide1.jpg
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 110
Joined: Sun Aug 19, 2012 4:39 am
Thanked: 9 times
GMAT Score:640

by Ankur87 » Wed May 01, 2013 9:43 am
nice and easy method..
i wasnt able to get the question.
thnks..
Anurag@Gurome wrote:
smackmartine wrote:A satellite is composed of 30 modular units, each of which is equipped with a set of sensors, some of which have been upgraded. Each unit contains the same number of non-upgraded sensors. If the number of non-upgraded sensors on one unit is 1/5 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?
Say, total number of upgraded sensor in the satellite is x.

Hence, number of non-upgraded sensors in each unit = 1/5 of x = x/5
Hence, number of non-upgraded sensors in the satellite, i.e. 30 units = 30*(x/5) = 6x

Hence, the required fraction = (Number of upgraded sensors)/(Total number of sensors) = x/(x + 6x) = 1/7

The correct answer is D.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
GMAT Instructor
Posts: 2630
Joined: Wed Sep 12, 2012 3:32 pmFollowed by: 119 members
Location: East Bay all the way
Thanked: 625 times
GMAT Score:780

by Matt@VeritasPrep » Wed May 01, 2013 9:05 pm
You can also sort this out pretty neatly with a little word translation. It isn't as short and sweet as the other answers, but it seems easier for most people to cook up under time constraints.

Call x the number of upgraded sensors on each unit.
Call y the number of non-upgraded sensors on each unit.

"The number of non-upgraded sensors on each unit"
y

"is"
=

"1/5 the total number of upgraded sensors on the entire satellite"
1/5 * (30x)

So we have y = 1/5 * 30x, which simplifies to 5y = 30x. Now we just need the ratio of upgraded sensors to total sensors:

Upgraded/Total

= 30x / 30(x+y)
= 30x / (30x + 30y)

(then substitute 5y for 30x, since they're equal)

= 5y / (5y + 30y)
= 1/7
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1