A and B can do a piece of work in 10 days and 20 days, respectively. If they work on alternate days,….

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A and B can do a piece of work in 10 days and 20 days, respectively. If they work on alternate days, then find the least number of days in which the work will be completed.

Options :-

1. 13
2. 14
3. 12
4. 18
5. 15

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