A cask contains a mixture of $49\ litres$ of wine and water in the ratio $5 : 2$. How much water must be added to it so that the ratio of wine to water is $7 : 4$?
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A cask contains a mixture of $49\ litres$ of wine and water in the ratio $5 : 2$. How much water must be added to it so that the ratio of wine to water is $7 : 4$?