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Mathematics 20 Online
OpenStudy (anonymous):

A chemist has one 30-L bottle of 15% hydrochloric acid and one 30-L bottle of 90% hydrochloric acid. She mixes 20L of 60% hydrochloric acid and then pours 5L of that solution back into the bottle containing the 90% hydrochloric acid. How strong is the acid in that bottle now?

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