TCS Company Numerical Ability Alligation or Mixture

mixture of milk and water has been kept in two separate containers.ratio of milk to water in one of the containers is 5:1 and that in the other container is 7:2. in what ratio the mixtures of these two containers should be added together so that the quantity of the milk in the new mixture may becomes 80%?

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TCS Other Question

two alloys contain zinc and copper in the ratio of 2:1 and 4:1. in what ratio the two alloys should be added together to get as new alloy having zinc and copper in the ratio of 3:1? a/b=5/3,b/c=2/3,c/d=7/5,and a+b+c+d=1100. then what is the value of b?