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C is 100% more efficient than B. A alone...

C is 100% more efficient than B. A alone can complete a piece of work in 9 days and B & C together can complete the same work in `2(2)/(3)` days. Find what portion of work will be completed, if A & B works together for 4 days.

A

`(13)/(18)`

B

`(8)/(9)`

C

`(5)/(6)`

D

`(17)/(18)`

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