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A satellite is composed of 30 modular units, each of which

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A satellite is composed of 30 modular units, each of which [#permalink] New post 27 Aug 2011, 11:52
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46% (02:21) correct 53% (01:18) wrong based on 3 sessions
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
[Reveal] Spoiler: OA

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Re: Satellite Sensors [#permalink] New post 27 Aug 2011, 19:56
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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?

No of Units-30
Let there T-Total no of sensor
U-no of upgraded sensors in one unit
Nu-No 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

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Re: Satellite Sensors [#permalink] New post 27 Aug 2011, 20:32
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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.
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Re: Satellite Sensors [#permalink] New post 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.
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Re: A satellite is composed of 30 modular units, each of which [#permalink] New post 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 :)
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Re: Satellite Sensors [#permalink] New post 08 Oct 2012, 11:57
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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 non-upgraded... Annoying a little bit.

If N is the number of non-upgraded 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 non-upgraded 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 non-upgraded 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.
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Re: A satellite is composed of 30 modular units, each of which [#permalink] New post 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 700-800 level by the way, so maybe it needs to be somewhat painful ;)
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Re: A satellite is composed of 30 modular units, each of which   [#permalink] 17 Jan 2013, 06:23
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