A member added or replaced: new average or the member's value

This type of question, asked 3 times: 3 Mar 2023 Tier II, 6 Mar 2023 Tier II, 26 Oct 2023 Tier II. All 3 questions below, oldest first.

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Question 1
3 Mar 2023 Tier II
18 $The average weight of three men is increased by 4 kg when one of them, whose weight is 100 kg, is replaced by another man. What is the weight of the new man?$
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Question 2
6 Mar 2023 Tier II
21 $The average marks obtained by Saloni in four papers is 51, and in the fifth paper she gets 56 marks. Find her new average in all five papers.$
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Question 3
26 Oct 2023 Tier II
11 $The average weight of the first thirteen persons among fourteen persons is 78 kg. The weight of the 14th person is 39 kg more than the average weight of all the fourteen persons. Find the weight of the 14th person.$
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Question 1