Q. 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

Explanation : 

In a group of 120 persons 80 are indian

Total Information:
– Total number of persons = 120
– Number of Indians = 80
– Number of Foreigners = 40
– Total English speakers = 70

Analysis:

1. Given that all 40 foreigners can speak English:
– Foreigners who speak English = 40
– Remaining English speakers must be Indians
– Indians who speak English = Total English speakers – Foreigners
– Indians who speak English = 70 – 40 = 30

Conclusion:
Therefore, at least 30 Indians must be able to speak English.