Multiple choice

The average marks of five subjects is 27 out of 30. If one subject's marks is excluded, the average becomes 25. The marks in the excluded subject is

  1. 25

  2. 27

  3. 30

  4. 35
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total marks for 5 subjects = 27 × 5 = 135. After excluding one subject, 4 subjects have average 25, so their total = 25 × 4 = 100. The excluded subject = 135 - 100 = 35. Common mistake: assuming the excluded subject equals the old average (27) or new average (25).

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