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A can do a work in 12 days. B works 60% ...

A can do a work in 12 days. B works` 60%` more fast than A then in how many days B alone could finish this work ?

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`because`A’s work in 1 day =`1/12`
`therefore` B’s work in 1 day = `1/(12) xx 160/ 100` `therefore` B alone can finish this work in `(15)/2` days, i.e., `(7)1/2` days.
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