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A, B and C, one can do a piece of work i...

A, B and C, one can do a piece of work in 9, 12 and 18 days respectively. They all started the work together, but A left after 3 days. In how many days, was the remaining work completed?

A

2

B

`5//2`

C

`11//4`

D

`9//5`

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