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The average marks obtained in a class of 50 students is 70%. The average of first 25 is 60% and that of 24 is 80%. What is the marks obtained by the last student?
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- 90%
- 60%
- 80%
- 70%
Correct Option: C
Total marks of 50 students = 50 × 70 = 3500
Total marks of 25 students = 25 × 60 = 1500
Total marks of 24 students = 24 × 80 = 1920
∴ Marks obtained by last student = 3500 – 1500 – 1920
= 80 i.e, 80%
