Multiple choice

The average of marks obtained by 125 candidates in a certain examination is 40. If the average marks of passed candidates is 40 and that of the failed candidates is 20, what is the number of candidates who passed the examination?

  1. 90

  2. 85

  3. 125

  4. 120

  5. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Let the number of passed candidates be x.Then, total marks = 125 x 40 = 40x + (125 – x) x 20 = 5000 = 40x + 2500 – 20x = 20x = 2500Therefore, x = 125