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:  Choose the correct answer
A) 1 / 3
B) 2 / 3
C) 2 / 5
D) 3 / 5
E) 4 / 5

Rationale: "explanation : by the rule of alligation , we have : so , ratio of 1 st and 2 nd quantities = 7 : 14 = 1 : 2 required quantity replaced = 2 / 3 . answer is b"
Answer: B