Two liters of a 30% acid solution are mixed with three liters of a $80\%$ acid solution. What percent of the mixture is acid?
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\(0.3\cdot 2l+0.8\cdot 3l=x\cdot 5l\\ 5\cdot x=3 \)
\(x=\dfrac{3}{5}=0.6\)
60% of the mixture is acid.
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