# 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 : **

## Percentage of Boys Among Foreign Students in a Class

The number of Indian students is 60% of 100 = 60.

The number of foreign students is 100 – 60 = 40.

The number of girls among Indian students is 30% of 60 = 18.

The total number of girls in the class is 50% of 100 = 50.

So, the number of girls among foreign students is 50 -18 =32

Therefore, the number of boys among foreign students is (40 -32) =8 So, the percentage of boys among foreign students is (8/40)*100=20% Hence, option (d) i.e. 20% is correct.