Using proportions, it is found that the total number of tubes is 8.
A proportion is a fraction of total amount, and the measures are related using a rule of three.
In this problem, every pair of stations is connected by two tubes, that is, for each station there is a tube. How many tubes are there in 8 stations?
The rule of three is:
1 tube - 1 station
x tubes - 8 stations
Applying cross multiplication, we have that x = 8.
Hence, the total number of tubes is 8.
You can learn more about proportions at https://brainly.com/question/24372153
