Author 
Message 
TAGS:

Hide Tags

Manager
Joined: 25 Aug 2008
Posts: 137
Location: India
WE 1: 3.75 IT
WE 2: 1.0 IT

A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
27 Aug 2011, 11:52
Question Stats:
52% (02:22) correct 48% (02:23) wrong based on 579 sessions
HideShow timer Statistics
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 nonupgraded sensors. If the number of nonupgraded 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
Official Answer and Stats are available only to registered users. Register/ Login.




GMAT Club Legend
Joined: 12 Sep 2015
Posts: 4125
Location: Canada

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
23 Sep 2016, 15:17
varunmaheshwari 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 nonupgraded sensors. If the number of nonupgraded 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 Since we're asked to find a certain FRACTION, we can plug in some nice values that meet the given conditions. Let's say that there's a TOTAL of 5 upgraded sensors on the entire satellite the number of nonupgraded sensors on one modular unit is 1/5 the TOTAL number of upgraded sensors on the entire satelliteSo, the number of nonupgraded sensors on EACH modular unit = (1/5)( 5) = 1. Since there are 30 modular units altogether, the TOTAL number of nonupgraded sensors = (30)( 1) = 30. So, the TOTAL number of sensors = (number of nonupgrades) + (number of upgraded) = 30 + 5 = 35What fraction of the sensors on the satellite have been upgraded?= 5/ 35= 1/7 Answer: Cheers, Brent
_________________
Test confidently with gmatprepnow.com




Manager
Joined: 14 Mar 2011
Posts: 50

Re: Satellite Sensors
[#permalink]
Show Tags
27 Aug 2011, 19:56
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 nonupgraded sensors. If the number of nonupgraded 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?
No of Units30 Let there TTotal no of sensor Uno of upgraded sensors in one unit NuNo of Not upgraded senor in one unit
T= 30U+30Nu
Now we know that Nu=1/5 (30U)= 6U
So Total= 30U+30*6U = 30U+180U= 210U
Fraction= 30U/210U = 1/7 Answer is D
Regards Jagdeep Give Kudos if you like my post




Director
Joined: 01 Feb 2011
Posts: 531

Re: Satellite Sensors
[#permalink]
Show Tags
27 Aug 2011, 20:32
number of non upgraded sensors per unit = 1/5 (U) where U is the total number of upgraded sensors in 30 units.
=> number of non upgraded sensors in 30 units = N= 30*(1/5)U= 6U
total number of sensors = U + N = U+6U = 7U
=> upgraded is U/(7U) fraction of the total = 1/7
Answer is D.



Manager
Joined: 21 May 2012
Posts: 86
Location: United States (CA)

Re: Satellite Sensors
[#permalink]
Show Tags
26 May 2012, 21:49
Does anyone else find this problem hard to understand and translate into an equation? I understand it clearly after the explanation but I think it is poorly worded.



Senior Manager
Joined: 06 Aug 2011
Posts: 317

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
08 Oct 2012, 11:39
Bunuel..i got this question wrong in my MGMAT TEST.. will u send me some liink of question like this?? I got confused when i saw fraction question like this..and hard percentage question.. Thank u
_________________
Bole So Nehal.. Sat Siri Akal.. Waheguru ji help me to get 700+ score !



Director
Joined: 22 Mar 2011
Posts: 584
WE: Science (Education)

Re: Satellite Sensors
[#permalink]
Show Tags
08 Oct 2012, 11:57
Cares wrote: Does anyone else find this problem hard to understand and translate into an equation? I understand it clearly after the explanation but I think it is poorly worded. Not really poorly worded, but maybe lengthy, and all those words, upgraded and nonupgraded... Annoying a little bit. If N is the number of nonupgraded sensors in every one of the 30 units, and U is the number of those upgraded, we can write N = (1/5)*30U = 6U. This is the key equation, it is the translation of the information " ...the number of nonupgraded sensors on one unit is 1/5 the total number of upgraded sensors on the entire satellite...". So, we have U upgraded sensors and 6U nonupgraded ones, which means that the upgraded sensors represent U/7U = 1/7 from the total number of sensors. No need to multiply by 30, we are given that each unit has the same number of sensors of each type. Anyway, if you multiply by 30, it will cancel out and the final ratio is the same 1/7. Answer D.
_________________
PhD in Applied Mathematics Love GMAT Quant questions and running.



Manager
Joined: 13 Feb 2012
Posts: 129
Location: Italy
Concentration: General Management, Entrepreneurship
GPA: 3.1
WE: Sales (Transportation)

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
17 Jan 2013, 06:23
The question needs to be read very carefully and under timed conditions it's very easy to lose track with the wording; in the review of my Mgmat exam is ranked as 700800 level by the way, so maybe it needs to be somewhat painful



SVP
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1727
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
13 Apr 2014, 23:10
Lets say total no. of upgraded sensors on whole satellite = 30 Then each module will have 1 upgraded sensor ......... (1) \(\frac{1}{5} th of 30 = 6\) nonupgraded sensor on each module....... (2)
Total sensors in one module = (1) + (2)
= 6+1 = 7
Total sensors on all 30 modules = 30 * 7 = 210
\(Fraction = \frac{30}{210} = \frac{1}{7}\)
Answer = D



Intern
Joined: 09 Nov 2013
Posts: 9

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
15 Apr 2014, 06:18
varunmaheshwari 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 nonupgraded sensors. If the number of nonupgraded 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 Thanks for the explanations on this question! It took me a while to understand this question  the wording kept throwing me off. I finally approached it as below: There are 30 Units, each with multiple sensors. Sensors are either U or NU Total number of sensors = total U + total NU Given that total NU = 1/5 U; then 5NU = U Also, there are same number of NUs in each unit; therefore 30NUs in total Now plugging into the first equation: Total sensors = 5NU + 30 NU = 35 NU Question asks for total U/total sensors = 5NU/35NU = 1/7 Hope this helps!



Current Student
Joined: 23 May 2013
Posts: 183
Location: United States
Concentration: Technology, Healthcare
GPA: 3.5

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
30 May 2014, 11:04
varunmaheshwari 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 nonupgraded sensors. If the number of nonupgraded 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 A slightly different approach: Let x be the number of nonupgraded sensors on a single unit (which is the same for all units). Therefore, there are 30x non upgraded units on the entire satellite. We also know that the number of nonupgraded units on a single unit (which is x) is 1/5 the total number of upgraded sensors. Therefore, 5x equals the total number of upgraded units. Thus, to find the fraction that have been updated, we simply take upgraded/total, which is 5x/ (30x+5x) = 5/35 = 1/7. Answer: D



Intern
Joined: 22 Feb 2015
Posts: 7

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
11 May 2015, 08:57
Let "n" be total number of set sensors in each unit and 'x' non upgraded sensors.(nx) upgraded ones.Thus,
x=1/5(nx)(30) Solving, x=6/7n There fore 16/7=1/7 upgraded ones



Senior Manager
Joined: 10 Mar 2013
Posts: 461
Location: Germany
Concentration: Finance, Entrepreneurship
GPA: 3.88
WE: Information Technology (Consulting)

A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
26 Dec 2015, 14:13
varunmaheshwari 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 nonupgraded sensors. If the number of nonupgraded 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 30 Units Upgraded: U, means total #of Upgraded = 30*U NonUpgraded: N \(N=0.2*30*U\) > \(\frac{U}{N}=\frac{1}{6}\), \(\frac{U}{ALL}=\frac{1}{7}\) Answer D



Director
Joined: 23 Jan 2013
Posts: 522

A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
28 Dec 2015, 03:44
let: x  all upgraded y  all nonupgraded
what is x/x+y?
y/30=(1/5)x
y/30=x/5, so x=(1/6)y
(1/6)y/(1/6)y+y => (1/6)y/(7/6)y=1/7
D



VP
Joined: 07 Dec 2014
Posts: 1218

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
01 Jan 2016, 14:47
let u=total upgraded sensors let n=total nonupgraded sensors u/5=n/30 u/n=1/6 u/(n+u)=1/7



Manager
Joined: 12 Aug 2015
Posts: 117
Location: India
Concentration: General Management, Strategy
Schools: Kellogg 1YR '18, LBS '19, Insead Sept '17, Oxford"18, Judge"18, HKUST '19, ISB '18, IIMA , IIMB, IIMC , NTU '18, XLRI GM"18, IIMA PGPX"18
GPA: 3.38

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
07 Mar 2016, 09:22
Please advise if this is wrong: Let, upgraded sensors be: U Non upgraded senseors be: NU Total= U+NU Now., NU=(1/5)U Hence, Total = U+(1/5)U = (6/5)U U=(5/6)Total So, wont the answer be A. varunmaheshwari 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 nonupgraded sensors. If the number of nonupgraded 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



Math Expert
Joined: 02 Aug 2009
Posts: 8281

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
23 Sep 2016, 18:53
1988achilles wrote: Please advise if this is wrong: Let, upgraded sensors be: U Non upgraded senseors be: NU Total= U+NU Now., NU=(1/5)U Hence, Total = U+(1/5)U = (6/5)U U=(5/6)Total So, wont the answer be A. varunmaheshwari 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 nonupgraded sensors. If the number of nonupgraded 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 Hi, You have gone wrong on NU = (1/5)U... It is NU per sensor, so NU/30=(1/5)U.....NU=30/5*U=6U.. Total = U+NU= U+6U=7U.. Therefore fraction of upgraded = U/7U=1/7...
_________________



Manager
Joined: 22 Feb 2016
Posts: 82
Location: India
Concentration: Economics, Healthcare
GMAT 1: 690 Q42 V47 GMAT 2: 710 Q47 V39
GPA: 3.57

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
03 Dec 2016, 23:24
Extremely tricky wording. I hope I don't encounter something like this on my actual exam. I really did not understand it at al Bunuel please help



Manager
Joined: 14 Oct 2012
Posts: 158

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
16 Apr 2017, 09:25
NUS  non upgraded sensors US  upgraded sensors
Attachments
29..jpg [ 616.41 KiB  Viewed 10084 times ]



Intern
Joined: 25 May 2015
Posts: 17

Re: A satellite is composed of 30 modular units, each of which
[#permalink]
Show Tags
26 Mar 2018, 07:23
What I am missing
Let say the total set of sensors in each unit is 5
so the total is 5*30 = 150
1/5 of the sensors that are not upgraded is 1/5 * 150 = 30
30/150 =1/5 which is not 1/7
Please, could anyone help me with this?




Re: A satellite is composed of 30 modular units, each of which
[#permalink]
26 Mar 2018, 07:23



Go to page
1 2
Next
[ 24 posts ]



