A satellite is composed of 24 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 1/6 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?
Select the correct option.
A) 5/6  B) 1/5  C) 1/6  D) 1/7  E) 1/24
Let x be the number of upgraded sensors on the satellite.   The number of non-upgraded sensors per unit is x/6.   The number of non-upgraded sensors on the whole satellite is 24(x/6) = 4x.   The fraction of sensors which have been upgraded is x / (x+4x) = x/5x = 1/5   The answer is 1/5.
<result>B</result>
A satellite is composed of 24 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 1/6 the total number of upgraded sensors on the entire satellite, what fraction of the sensors on the satellite have been upgraded?