In a $40 \, L$ mixture of milk and water,the ratio of milk to water is $7:1$. In order to make the ratio of milk and water $3:1$,the quantity of water (in $litres$) that should be added to the mixture will be:
- A$6$
- B$6 \frac{1}{2}$
- C$6 \frac{2}{3}$
- D$6 \frac{3}{4}$
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