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For doing a certain work, the efficiencies of A, B and C are in the ratio 2 : 3 : 5. Working together, they can complete the same work in 15 days. B and C can complete 80% of the original work in:
A can do a piece of work in 6 days. B can do it in 9 days. With the assistance of C they completed the work in 3 days. In how many days can C alone do the work ?