A and B can do a work in 12 days and 36 days respectively. If they work on alternate days beginning with B, in how many days will the work be completed

Question:A and B can do a work in 12 days and 36 days respectively. If they work on alternate days beginning with B, in how many days will the work be completed

1. 20 2/3

2. 9C. 24

3. 26 5/9

4.None of these


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