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A can do a work in 36 days and B in 12 days. If they work on it together, then in how many days will they be able to do the work?
Let total work = L.C.M of 36&12 = 36units
A's efficiency = 36/36 = 1
B's efficiency = 36/12 = 3
To complete total work, i.e; 36 units of work,
both can take $$\frac{36}{1+3}=9$$ days
so the answer is option D.
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