A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find in how many days both can do the work?

 A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find in how many days both can do the work?

A). 28

B). 20

C). 34

D). 12

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