UPSC CAPF Assistant Commandant Model Paper 5

GIVEN:
60% people watch Netflix, 72% people watch Amazon prime and 45% watch both of them.
Calculation
Total people who watch any of them = (People who watch Netflix) + (People who watch Amazon prime) – (People who watch both of them)
Let the total number of people in the office be x
So,
Total number of people who watch any of them = 0.6x + 0.72x – 0.45x
= 0.87x
Hence,
Number of people who do not watch any of them = x – 0.87x = 0.13x
Given that 52 people do not watch any of them.
So,
0.13x = 52
⇒ x = 400
∴ Number of people in the office = 400