This is the all question?
The process is:
C = 2nr
2nr = c
r (2n) = c

That's the answer☝️☝️☝️☝️
or maybe this one
r = 2n + c
sorry, I'm unsure, it has been too long since I studied that...
Answer:
13 and 14
Step-by-step explanation:
Difference = 48-19
= 29
production decrease = 29 × 100/ 48
= 60.41%