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A can do a work in 20 days and B can do ...

A can do a work in 20 days and B can do the same work in 30 days. In how many days, can A and B together do the work?
(A) 10
(B) 12
(C) 15
(D) 16

A

12 days

B

10 days

C

50 days

D

25 days

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