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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? |
23% 21.5% 22% 22.5% |
22% |
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 % |
