A can do a piece of work in 20 days and B in 15 days. With help of C, they finis

Question

A can do a piece of work in 20 days and B in 15 days. With help of C, they finish the work in 5 days. In how many days C alone can do the same work ?

Options:

A . 5 days

B . 6 days

C . 10 days

D . 12 days

Answer: Option D

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