Known items taken out of the total: average of the rest

This type of question, asked 4 times: 14 Sep 2025 S2, 21 Sep 2025 S2, 23 Sep 2025 S2, 23 Sep 2025 S3. All 4 questions below, oldest first.

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Question 1
14 Sep 2025 S2
59 $The monthly average salary for 8 employees plus one supervisor is ₹15,000. If the supervisor earns ₹25,000, what is the average salary of the 8 employees?$
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Question 2
21 Sep 2025 S2
64 $The average weight of 10 boxes is 15.5 kg. If the heaviest box weighs 21 kg and the lightest weighs 10 kg, what is the average weight of the remaining boxes?$
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Question 3
23 Sep 2025 S2
63 $A group of 6 students went on a trip and spent Rs. 1200 in total. If one of them spent Rs. 300 while the rest spent equally, what was the average spending of the other 5 students?$
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Question 4
23 Sep 2025 S3
63 $The average of 5 different numbers is 24. If the smallest number is 15, what is the average of the remaining four numbers?$
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Question 1