Multiple choice

In a class of $50$ students, $10$ have failed and their average marks are $28$. The total marks obtained by the entire class are $2800$. The average marks of those who have passed are

  1. $43$
  2. $53$
  3. $63$
  4. $70$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total marks = 2800. Marks of 10 failed students = 10 * 28 = 280. Marks of 40 passed students = 2800 - 280 = 2520. Average of passed students = 2520 / 40 = 63.

AI explanation

The total marks for the 10 failed students are 10 multiplied by 28, giving 280. This leaves 2800 minus 280, or 2520 marks for the students who passed. Since the class has 50 students and 10 failed, 40 students passed. Dividing the 2520 passing marks by 40 gives an average of 63 marks for those who passed.

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