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When one ounce of water is added to a mixture of acid and water, the new mixture is $20\%$ acid. When one ounce of acid is added to the new mixture, the result is $33\frac13\%$ acid. The percentage of acid in the original mixture is
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When one ounce of water is added to a mixture of acid and water, the new mixture is $20\%$ acid. Whe...
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