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A and B can do a piece of work in 12 days, B and C in 15 days, C and A in 20 days. How long A alone will take to do the work?
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Nandan
(A+B)'s one day work is 1/12 (B+C)'s one day work is 1/15 (C+A)'s one day work is 1/20 Thus,2(A+B+C)'s one day work is 1/12+1/15+1/20=1/5
so,(A+B+C) can complete the work in 10 days.
(A+B+C)'s one day work=1/10 A 's one day work=1/10-1/15=1/30
So A can complete the work in 30 days
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