A works for 5 days, B works for 7 days, and C works for x days to complete a piece of work. Their daily wages are in the ratio 5 : 4 : 3. If the total wage paid is Rs. 6,720, and A and B together complete 60% of the total work, find the total wage received by C.

A, B, and C together receive ₹5400 for doing a work in 36 days. A and C together receive ₹1880 for doing the same work in 20 days, while B and C together receive ₹3040 for doing the same work in 40 days. Find the daily amount received by C.

A and B can do a piece of work in 12 days and 15 days respectively. They started the work together. After some days, 'B' left the job and 'A' finished the remaining work in 3 days. If A and B are employed to do the entire work for ₹6600, find B's share.