Overall average and one subgroup's average given: average of the other subgroup

This type of question, asked 4 times: 26 Jul 2023 S2, 12 Sep 2025 S2, 13 Sep 2025 S3, 23 Sep 2025 S3. All 4 questions below, oldest first.

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Question 1
26 Jul 2023 S2
69 $In a class of 60 students, there are 35 boys. The average weight of boys is 42 kg and the average weight of the full class is 46.5 kg. Find the average weight of girls in the class.$
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Question 2
12 Sep 2025 S2
56 $In a team of 75 employees, the average monthly sales per employee is ₹ 1.8 lakh. If 30 junior employees average ₹ 1.2 lakh each, what is the average monthly sales figure (in ₹ lakh) for the senior employees?$
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Question 3
13 Sep 2025 S3
58 $24$
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Question 4
23 Sep 2025 S3
65 $The average score of 25 students in a test is 68. The top 5 scorers had an average of 80, and the lowest 5 had an average of 50. What is the average of the remaining 15 students?$
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Question 1