A B and C can do a piece of work in 15 12 and 20 days respectively they started the work together but she left after 2 days in how many days will the remaining work be completed by a and b
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15,12,20 LCM = 60
efficiency = 4,5,3
in first 2 days they do = 12*2 = 24 unit of work
left work now is 36 unit and , A and B will take = 36/9 = 4 days [ Ans.]
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