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 =

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4 just count how many are there that are between 19-21
PQ = 18
Since the triangles are similar the sides are proportional
The scale factor to dilate the smaller triangle to the bigger one is 3
6*3= 18