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A and B together can do a work in 12 day...

A and B together can do a work in 12 days. A alone can do this in 20 days. If B works half a day then in how many days A and B together can complete the work?

A

1. 15

B

2. 18

C

3. 20

D

4. 30

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The correct Answer is:
A
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