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(A + B) can do a piece of work in 10 day...

(A + B) can do a piece of work in 10 days. A works `2(1)/(2)` days and B works for `8(1)/(2)` days, then half of the work has been completed. In how many days will B do this work alone ?

A

20

B

24

C

18

D

30

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