17. Roshan Lal is a milk man and suppliesmilk from door to door in his village Kotli.Normally his 20 litres of a mixturecontains milk and water in the ratio3: 1. He has a habit of mixing water tomilk. So how much milk must he add tothis mixture to get a mixture containingmilk and water in the ratio 4:1?
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:5 litres
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