Q. In a class, 60% of students are from India and 50% of the students are girls. If 30% of the Indian students are girls, then what percentage of foreign students are boys?
(a) 45%
(b) 40%
(c) 30%
(d) 20%
Correct Answer: (d) 20%
Question from UPSC Prelims 2021 CSAT Paper
Explanation :
In a class 60 of students are from india
Given:
– Total students = 100
– Indian students = 60%
– Foreign students = 40
– Total girls = 50%
– Indian girls = 30% of 60 = 18
Step-by-step solution:
1. Foreign girls = Total girls – Indian girls
= 50 – 18 = 32
2. Foreign boys = Total foreign – Foreign girls
= 40 – 32 = 8
3. Percentage of boys among foreign students
= (8/40) × 100 = 20%
Answer: (d) 20%
