Q. The average marks obtained by 120 students in an exam is 35. If the average marks obtained by successful students is 39 and the average marks obtained by unsuccessful students is 15 then what is the number of successful students?

A) 80

B) 110

C) 100

D) 90

✔ Correct Answer: 100

Exam Insight

Let the number of successful students be x. The equation is 39x + 15(120 - x) = 35 × 120. Solving for x, we get x = 90. Thus, there are 90 successful students.

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Q. The average marks obtained by 120 students in an exam is 35. If the average marks obtained by successful students is 39 and the average marks obtained by unsuccessful students is 15 then what is the number of successful students?

Exam Insight

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