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[" A does "(4)/(5)" of a piece of work i...

[" A does "(4)/(5)" of a piece of work in "20" days.He "],[" then calls in "B" and they finish the remaining "],[" work in "3" days.How long "B" alone will take to "],[" do whole work? "/" A factil "],[" fatt "(pi)/(4)" and "(7)/(8)" ,for "B" and "]

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