A and B can do a piece of work in 12 days B and C in 15 days and C and A in 20 days how much time will A alone take to finish the job
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16 day ...bcz a and b work finished 12 day that mean A done work 6 day and same B. now a.and c doing same work in 20 day that men A doing work in 10 day alone ..equl 10+6 = 16..
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