If 30 ml solution of 20% alcohol is mixed with 20 ml solution of 25% alcohol, then what is the strength of alcohol in the mixture?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 22%
The strength of the mixture is the total alcohol divided by the total volume.
Alcohol in the first solution \(=20\%\) of 30 ml \(=6\) ml
Alcohol in the second solution \(=25\%\) of 20 ml \(=5\) ml
Strength \(\displaystyle =\frac{6+5}{30+20}\times100=\frac{11}{50}\times100=22\%\)