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Persons A, B, and C can finish a work in 15, 10, and 12 days respectively. Person B and person C start the work together but are asked to leave after 4 days. In how many days will the remaining work be done by person A?





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A-------15
B-------10
C-------12

Total work (LCM of A,B,C) = 60
Work done by B and C in a day = (6+5)=11

B and C word done in 4 days = 44
Remaining work for A=16

A completes 4 work in a day, so A take 4 more days to complete 16 works.


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