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Rakesh can do piece of work in 20 days. ...

Rakesh can do piece of work in 20 days. How much work can be do in 4 days?

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Rakesh can do a piece of work in `20` days
Rakesh one day work` = 1/20`
Rakesh` 4 `days work `= 4/20 = 1/5`
He can do the `1/5th` of the work in `4` days
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