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A ???? ??? ?? - ??? 20 ????? ??? ???? ??, ??? B ?? ????? ?????? ??? ?? ?? ????? ??? ??? 3 ??? ??? ???? ???? ???,?? B ????? ?? ??? ?? ????? ????? ??? ????? ??
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A finishes some fraction of work in twenty days. Rest if the work he completes with the help of B within three more days. In this situation, the days taken by B to complete the work alone, will depend on how much fraction of work A can do alone. The data is inadequate, to tell the number of days taken by B.
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