TCS Company Numerical Ability Ratio and Proportion

How much water must be added to 60 litres of milk at 1 ½ litres for Rs. 2
So as to have a mixture worth Rs.10 2/3 a litre ?

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TCS Other Question

x=(sin nx/n)=? In what ratio must water be mixed with milk to gain 20 % by selling the mixture at cost price?