Multiple choice

The average marks obtained in a class of 50 students is 70\%. The average of first 25 is 60\% and that of last 24 is 80\%. What is the marks obtained by the last student?

  1. $90\%$
  2. $60\%$
  3. $80\%$
  4. $70\%$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total marks for 50 students at 70% average = 50 × 70 = 3500. First 25 students: 25 × 60 = 1500. Last 24 students: 24 × 80 = 1920. Last student's marks = 3500 - 1500 - 1920 = 80%, which matches option C.

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