<PRE><B>Question 1144979</B>
Same problem, different numbers.
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Joan has a solution that is 18% acid and a second solution that is 43% acid. How many liters of each should she mixed together to get an 80L solution that is 26.5% acid?
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e = amount of 18%
f = amount of 43%
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e + f = 80 ----- total solution
18e + 43f = 80*26.5 ---- total acid
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Can you do the rest?</PRE>