In a group of 120 persons, 80 are Indians and rest are foreigners. Further, 70 persons in the group can speak English. The number of Indians who can speak English is
A
20
B
30
C
30 or less
D
30 or more
Correct Answer: Option D
Explanation
Let's solve this using the **Extreme Case Analysis** method, which is a standard pattern in UPSC CSAT (seen in 2019 [9] and 2017 [8]).
**1. Analyze the G