How much water (in litres) must be added to 80 litres solution of milk and water containing 10% milk, so that it becomes a 5% milk solution?
Quantity of mixture = 80 litres
Quantity of milk = $$\frac{10}{100}\times80=8$$ litres
Let $$x$$ litres of water is added
According to ques,
=> $$\frac{5}{100}(x+80)=8$$
=> $$x+80=8\times20=160$$
=> $$x=160-80=80$$ litres
=> Ans - (D)
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