The correct answer and im sure of it is 69
Step 2 is where the error was made.
You simply need to compute the ratio between the length of the segment
and the length of the corresponding segment
Answer:

is the fraction of sensors upgraded per unit.
Step-by-step explanation:
We are given the following in the question:
Let x be the number of upgraded sensors in one unit and y be the number of non-upgraded sensors in one unit.
Number of modular units = 30
Since some part of unit is upgraded and some are non-upgraded, then, we can write the equation:

Number of non-upgraded sensors =

Thus, we can write the equation:

Fraction of sensors upgraded per unit =
