A mixture of alcohol and water contains 35% alcohol by weight. If 25 g water is added to such a mixture of 100 g, then the percentage of alcohol in the mixture is
Question and options
A mixture of alcohol and water contains 35% alcohol by weight. If 25 g water is added to such a mixture of 100 g, then the percentage of alcohol in the mixture is
- 25%
- 28%
- 30%
- 32%
Answer and explanation
Correct answer: B - 28%
Alcohol = 35 g in 125 g of mixture, which is 28%. Adding water leaves the 35 g of alcohol unchanged, so 30% or 32% would need less water than 25 g to be added.
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