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Class of 30: average of 12 students and of the rest given, find the class average

The same question, asked 9 times: 11 Sep 2024 S1*, 11 Sep 2024 S3*, 13 Sep 2024 S3*, 17 Sep 2024 S2*, 19 Sep 2024 S3*, 23 Sep 2024 S3*, 24 Sep 2024 S3*, 25 Sep 2024 S2*, 25 Sep 2024 S3. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    11 Sep 2024 S1

    52
    A group of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 62. What is the average score of the group?

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  2. Question 2

    11 Sep 2024 S3

    59
    A class of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 74. What is the average score of the class?

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  3. Question 3

    13 Sep 2024 S3

    58
    A class of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 72. What is the average score of the class?

    Tap an option to check your answer.

  4. Question 4

    17 Sep 2024 S2

    70
    A group of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 76. What is the average score of the group?

    Tap an option to check your answer.

  5. Question 5

    19 Sep 2024 S3

    57
    A class of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 68. What is the average score of the class?

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  6. Question 6

    23 Sep 2024 S3

    60
    A class of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 60. What is the average score of the class?

    Tap an option to check your answer.

  7. Question 7

    24 Sep 2024 S3

    68
    A class of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 78. What is the average score of the class?

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  8. Question 8

    25 Sep 2024 S2

    51
    In the 8th8^{\text{th}} class, consisting of 30 students, a Mathematics test was taken. 10 students had an average score of 90. The other students had an average score of 75. What is the average score of the whole class?

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  9. Question 9

    25 Sep 2024 S3

    70
    A class of 30 students appeared in a test. The average score of 12 students is 60, and that of the rest is 80. What is the average score of the class?

    Tap an option to check your answer.