A and B can finish putting up the Christmas tree with decorations together in 10 days. B and C can do the same in 15 days. However, due to improper planning, all of them could not work together. Thus, A worked for 5 days and left. Then B worked for 10 days and left after which C finished the remaining work in 9 days. How much time would C have taken otherwise to finish the work all by himself?
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