A and B together can complete a work in 12 days. A alone can complete it in 20 d

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โœช Choose the correct option.

A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work?

10 days
11 days
15 days
20 days

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