Jar A contains 20% alcohol and 80% water. Jar B contains 40% alcohol and 60% water. If jars A and B are combined to form a solution that is 25% alcohol and 75% water, then the volume of jar A is what fraction of the resulting mixture?

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Jar A contains 20% alcohol and 80% water. Jar B contains 40% alcohol and 60% water. If jars A and B are combined to form a solution that is 25% alcohol and 75% water, then the volume of jar A is what fraction of the resulting mixture?