A jar full of whisky contains 40% alcohol. A part of this whisky is replaced by another containg 19% alcohol and now the percentage of alcohol was found to be 26%. What quantity of whisky is replaced ? Choose the correct option:
A) 1/3
B) 2by3
C) 2/5
D) 3/5
E) 4/5
Let us assume the total original amount of whiskey = 10 ml ---&gt; 4 ml alcohol and 6 ml non-alcohol.   Let x ml be the amount removed ---&gt; total alcohol left = 4-0.4x   New quantity of whiskey added = x ml out of which 0.19 is the alcohol.   Thus, the final quantity of alcohol = 4-0.4x+0.19x ----&gt; (4-0.21x)/ 10 = 0.26 ---&gt; x = 20/3 ml.   Per the question, you need to find the x ml removed as a ratio of the initial volume ---&gt; (20/3)/10 = 2/3.   Hence, 2by3 is the correct answer.
<result>B</result>
A jar full of whisky contains 40% alcohol. A part of this whisky is replaced by another containg 19% alcohol and now the percentage of alcohol was found to be 26%. What quantity of whisky is replaced ?