Question 72

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%. What quantity of whisky is replaced ?

Solution

0% alcohol solution is mixed with 19% alcohol solution to give 26% alcohol solution. 

w1/w2 = (A2 - Aavg)/(Aavg - A1)

= (40 - 26)/(26 - 19) 

= 14/7 = 2/1

So 2 parts of 19% solution were mixed with 1 part of 40% solution. This means that 2/3rd of the 40% solution was replaced by 19% solution. 


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