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A can do a piece of work in 30 days and ...

A can do a piece of work in 30 days and B can do the same piece of work in 20 days. They start working together and work for 4 days and then both leave the work. C alone finishes the remaining work in 18 days. In how many days will C alone finish the whole work?

A

72 days

B

64 days

C

100 days

D

120 days

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