A and b can do a work in 8 days, b and c can do the same work in 12 days. A, band c together can finish it in 6 days. A and c together will do it in:
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(a+b) 1 day work = 1/8
(b+c) 1 day work = 1/12
a+c) 1 day work = 1/6
now together they all will do in = 2(1/8+1/12+1/6) = (3+2+4/24) = 9/24 = 3/8 = 6/8
hence , 3/4 days will take by them together complete the work
(b+c) 1 day work = 1/12
a+c) 1 day work = 1/6
now together they all will do in = 2(1/8+1/12+1/6) = (3+2+4/24) = 9/24 = 3/8 = 6/8
hence , 3/4 days will take by them together complete the work
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