A, B and C can together finish a work in 3 days. A alone can do the same work in 8 days and B can do it in 6 days. How long will C take to complete the same work alone?
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1/8+1/6+c=1/3
(3+4)/24+c=1/3
7/24+c=1/3
c=1/3-7/24
c=(24+7)/24
c=31/24
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