A can do a piece of work in 12 day and B alone can do it in 16 days. They worked together on it for 3 days and then Aleft . How long did B take to finish the remaining work??
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12,16 Lcm = 48
efficiency of A and B = 4, 3
in 3 days both did = 3*(4+3) = 21 unit of work
left work to be done by B = 48-21 = 27 unit
He will take = 27/3 = 9 days (ans.)
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