A student's mark was wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half 1/2. What is the number of students in the class?

Options
1) 45
2) 40
3) 35
4) 30

• ans..40
  let the no of students be n and avg marks be x
  ((n-1)*x +63)/n+ 1/2 =((n-1)*x+83)/n
  solving above we get n=40
  
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