Multiple choice

The average of 60 students' results is 38. If the average of the first 22 students is 36 and that of the last 32 students is 32, then the average result of the remaining students is:

  1. 77.33

  2. 65.30

  3. 81.9

  4. 52.12
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A Correct answer
Explanation

Total sum = 60 * 38 = 2280. Sum of first 22 = 22 * 36 = 792. Sum of last 32 = 32 * 32 = 1024. Remaining students = 60 - 22 - 32 = 6. Sum of remaining = 2280 - 792 - 1024 = 464. Average = 464 / 6 = 77.33.

AI explanation

The total sum of all 60 results is 60 * 38 = 2280. The sum of the first 22 results is 22 * 36 = 792, and the sum of the last 32 results is 32 * 32 = 1024. The sum of these two groups is 792 + 1024 = 1816, leaving a remainder of 2280 - 1816 = 464 for the remaining 6 students. Dividing 464 by 6 gives an average result of 77.33 for the remaining students.

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