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

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Re: A satellite is composed of 30 modular units, each of which  [#permalink]

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New post 23 Aug 2018, 04:50
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 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


This is how i solved
Let the total no of upgraded sensor in entire sat be 30 ( ie 1 per 30 modular units )
now total no of unupgraded sensor per uinit = 1/5* 30 = 6
Total no of not upgraded sensore = 6* 30 = 180
Total no of sensors = 180 + 30 = 210

Target quest
= total no of upgraded sensors / total no of sesors

= 30 / 210 = 1/7
=D
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Re: A satellite is composed of 30 modular units, each of which  [#permalink]

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New post 18 Mar 2019, 08:15
Let total number of non-upgraded sensors be y
And total number of upgraded sensors be x
y/30 = x/5
>> y/x = 6/1
>> x/(x+y) = 1/(1+6) = 1/7
Hence, Option D

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Re: A satellite is composed of 30 modular units, each of which   [#permalink] 18 Mar 2019, 08:15

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