Several members leave and the average changes: average of those who left

This type of question, asked 2 times: 19 Jul 2023 S2, 24 Sep 2025 S3. All 2 questions below, oldest first.

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Question 1
19 Jul 2023 S2
57 $In a group of 32 students, the average weight was 18.5 kg. When 4 students left the group, the average came down to 15.5 kg. What was the average weight (in kg) of those 4 students?$
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Question 2
24 Sep 2025 S3
63 $The average of 12 results is 75. If the top two results are excluded, the average becomes 72. What is the average of the top two results?$
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Question 1