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
Quantity of alcohol in 30 ml solution =20% of 30 ml =6 ml
Quantity of alcohol in 20 ml solution =25% of 20 ml =5 ml
∴ Percentage of alcohol in the mixture = (6+5) ×100 /(30+20) =22 %