Question

In an examination, the average was found to be 50 marks. After deducting computerization errors, the marks of 100 candidates had to be changed from 90 to 60 each and average came down to 45 marks. The total number of candidates who took the examination was:

• A. 500
• B. 700
• C. 850
• D. 600

Answer 1

Answer:

D. 600

Let total number of students be X, Total marks obtained by x candidates = 50 x Difference in marks of 100 candidate =100 * 90 - 100 * 60 = 3000 According to question 50 x - 3000 = 45 x 5 x = 3000 x = 600