A brown flask contains a concoction that is 20% alcohol. A red flask contains a concoction with an unknown amount of alcohol. An equal amount of both flasks is poured into an empty jug. If the resulting mixture has an alcohol concentration that is 30% greater than the alcohol concentration of the brown flask, what percent alcohol did the red flask originally contain?
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Have you made an attempt at the question? Maybe start with the fact that your final concentration is 30% greater than 20%. You can also think of that as being 130% of 20%. What would that be?
What does "30% greater than the alcohol concentration" mean?
Does it mean that in the same amount of concoction, there is 30% more alcohol, or does it mean the concentration is 30 percentage points higher?