In an examinationthe average of marks was found to be 50.For deducting marks for computational errors,the marks of 100 candidates had to be changed from 90 to 60 each and so the average of marks came down to 45.the total no of candidates ,who appeared at the examination was

• Initially, average marks = 50
  Let the total number of candidates = x
  ATQ,
  50 × x= 45 × x+ 100 (90 – 60)
  50x– 45x= 100 × 30
  5x= 3000
  x= 600
  So, the total number of candidates = 600
• 7 years agoHelpfull: Yes(5) No(0)
• 5*x=30*100;
  x=600. Answer
• 6 years agoHelpfull: Yes(3) No(0)
• let total no of student=x
  Total average given=50
  total marks =50*x
  total error in marks=100*30;
  new average=45
  so,
  50*x-3000=45*x;
  x=600;
• 6 years agoHelpfull: Yes(1) No(0)