Answer

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UPSC Prelims

Mathematics

Theme:

Percentage / प्रतिशत

Q9 2021, Percentage

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?

एक कक्षा में, 60% विद्यार्थी भारत से हैं और विद्यार्थियों का 50% लड़कियाँ हैं। यदि भारतीय विद्यार्थियों में 30% लड़कियाँ हैं, तो विदेशी विद्यार्थियों में कितने प्रतिशत लड़के हैं?

Explanation Please wait..

Let total number of students in the class be 100.

Indian students = 60% of 100 = 60.

So, foreign students = 100 – 60 = 40 students.

Total number of girls students = 50% of 100 = 50.

Total number of Indian girl students = 30% of 60 = 18 students.

So, foreign girl students = 50 – 18 = 32.

As total foreign students = 40.

So, foreign boy students = 40 – 32 = 8.

So, percentage of boys among foreign students = (8/40) × 100 = 20%.

Hence, option (d) is the correct answer.

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