A can complete a piece of work in 9 days B in 12 days respectively. If they work for a day alternately in how days the work would be finished, If A begin's the work.
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Answer:
A = 9 days
B = 12 days
If they work for a alternately, then
A+B+A+B+A+B+A
= 9+12+9+12+9+12+9
= 72 days
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