Amount shared equally among n people, some drop out: new share each

The same question, asked 3 times: 16 Sep 2025 S2*, 23 Sep 2025 S2*, 24 Sep 2025 S1. Every wording below, oldest first.

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Question 1
16 Sep 2025 S2
25 $10 friends went for dinner and planned to split Rs. 200 equally. 2 didn't pay. How much did each of the rest pay?$
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Question 2
23 Sep 2025 S2
23 $9 people contribute Rs. 45 each. 3 leave. What amount must each pay now to keep total same?$
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Question 3
24 Sep 2025 S1
23 $Rs. 640 shared among 8 people. 2 back out. What’s new share per person?$
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Question 1