Time And Work

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A is twice as good a workman as B and together they finish a piece of work in 18 days. In how many days will A alone finish the work? A. 28 days B. 30 days C. 27 days D. 32 days E. None of these

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A can finish a piece of work in 63 days. He worked alone for 28 days and then B replaced him. If B could finish 1/3rd of the remaining work in 10 days. In how many days can B alone finish the whole work? (1) 54 (2) 51 (3) 72 (4) 45 (5) 36

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