Wages shared in proportion to work done

This type of question, asked 3 times: 20 Jul 2023 S2, 27 Jul 2023 S1, 14 Sep 2025 S3. All 3 questions below, oldest first.

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Question 1
20 Jul 2023 S2
57 $A,B and C can do a work in 10 days, 15 days, and 20 days, respectively. They finished that work together and got ₹2,600 as wages. Find C's wage.$
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Question 2
27 Jul 2023 S1
62 $Ashok and Anil undertake to do a piece of work for ₹4,500. Ashok alone could do the work in the 8 days and Anil in 12 days. With the assistance of Amar, they finished the work in 4 days. What is the share of Amar?$
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Question 3
14 Sep 2025 S3
62 $A alone can complete a job in 12 days and B alone in 18 days. A and B agree to do the work for ₹ 7,200. With C's help they finish it in 5 days. How much should C be paid?$
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Question 1