A and B could do a piece of work in 40 days. After working for 10 days they are assisted by C and the work is finished in 20 days more. If C does as much work in 3 days as B does in 4 days, in how many days could A alone do the same piece of the work?
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a+b can do it in 40 days.. time taken by a=240/5 x 9=48x9=432days.
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