A and B can complete work in 8 days .B and C can complete the same work in 12 days . If A alone can do that work in 16 days then how long would it take for A and C together to complete that work ?
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Hence, A and C together complete the work in 8 day. Similary it is 48/12 = 4 work for B & C and 48/6 = 8 work for A & B & C together. So, (A+B+C) - (A+B) = 4 work which is done by A alone.
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