13. A jar full
of whiskey contains 40% alcohol. A part of this whiskey is replaced by another
containing 19% alcohol and now the percentage of alcohol was found to be 26%.
The
quantity of whiskey replaced is?
Solution:
Strength
of first jar 40% Strength of 2nd jar
19%
Mean Strength 26%
7 14
So,ratio
of 1st and 2nd quantities =7:14 =1:2
Therefore
required quantity replaced =2/3.
