TCS Company Numerical Ability Ratio and Proportion

If the milk and water ware added in the ratio 5:4 then how much more water should be added so he gets the ratio of 6:7.

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TCS Other Question

If an old woman's age is the same as her three grand daughters i, mean the number of days old child=the no of weeks old child=no of months old child. The total years of all these people is 114 years then how old is the old woman?. A tank fills in the sequence of 10, 20, 40, 80.... (Means 10 litres in 1 hr, 20 litres in 2nd so on.). If at the 4th hour the tank is 1/4 full .When will it be full?