Subject: mathqa
Question: 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 / 6 the total number of upgraded sensors on the entire satellite , what fraction of the sensors on the satellite have been upgraded ?
Option: 
A: 1 / 6
B: 1 / 5
C: 1 / 7
D: 1 / 24
Answer: A