Mathematics · Time and Work

A and B complete a work in 21 days. If A alone can do it in 28 days, then in how many days can B alone complete three-fourth of the same work?

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A and B complete a work in 21 days. If A alone can do it in 28 days, then in how many days can B alone complete three-fourth of the same work?

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A and B complete a work in 21 days. If A alone can do it in 28 days, then in how many days can B alone complete three-fourth of the same work?

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