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Roshan Lal is a milk man and supplies milk from door to door in his village Kotli. Normally his 20 litres of a mixture contains milk and water in the ratio 3 : 1. He has a habit of mixing water to milk. So how much milk must he add to this mixture to get a mixture containing milk and water in the ratio 4 : 1?

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Roshan Lal is a milk man and supplies milk from door to door in his village Kotli. Normally his 20 litres of a mixture contains milk and water in the ratio 3 : 1. He has a habit of mixing water to milk. So how much milk must he add to this mixture to get a mixture containing milk and water in the ratio 4 : 1?






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