$A$ bottle full of whisky contains $50 \%$ alcohol. $A$ part of this whisky is replaced by another containing $18 \%$ alcohol and the percentage of alcohol was found to be $26 \%$. The quantity of whisky replaced is
- A$\frac{1}{4}$
- B$\frac{3}{4}$
- C$\frac{2}{5}$
- D$\frac{3}{5}$
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