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A and B can finish a piece of work in 20 days .B...

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A and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days. In how many days will A alone finish the job

(a) 48 (b) 34 2/7 (c) 44 (d) 45 (a) 48

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