Question

A jar full of whisky contains $40$% alcohol. A part of this whisky is replaced by another containing $19$% alcohol and now the percentage of alcohol was found to be $26$%. The quantity of whisky replaced is:

• A. $\frac{1}{3}$
• B. $\frac{2}{3}$
• C. $\frac{2}{5}$
• D. $\frac{3}{5}$

Answer 1

Answer: (B)

$\frac{2}{3}$

By the rule of alligation, we have:
So, ratio of $1^{st}$ and $2^{nd}$ quantities $=7:14=1:2$
$\therefore$ Required quantity replaced $=\frac{2}{3}$