10% of students taking admission in a course drop out before completing their course and among those drop outs 30% are girls. If total number of students taking admission in the college is 200 and among them 50 are girls, then number of girls who completed the course is

The correct answer is (b) 42.

The number of students who drop out is 10% of 200 = 20.
The number of girls who drop out is 30% of 20 = 6.
The number of girls who complete the course is 50 – 6 = 44.

Here is a step-by-step solution:

1. Find the number of students who drop out: 10% of 200 = 20
2. Find the number of girls who drop out: 30% of 20 = 6
3. Find the number of girls who complete the course: 50 – 6 = 44

Here is a brief explanation of each option:

• Option (a) is incorrect because it is the number of students who drop out, not the number of girls who complete the course.
• Option (b) is correct because it is the number of girls who are enrolled in the course minus the number of girls who drop out.
• Option (c) is incorrect because it is the number of girls who are enrolled in the course.
• Option (d) is incorrect because it is the number of students who drop out minus the number of girls who drop out.