Mathematics · Mixtures and Alligations

Equal quantities of mixture P (milk and water) and mixture Q (milk and water) are poured into an empty container R. The ratio of the quantity of milk to water in P is 5:7, whereas the ratio of the quantity of water to milk in Q is 1:3. If the ratio of the quantity of milk to water in the resultant mixture R is 59:m, find 'm%' of the total quantity of mixture P.