In what ratio should 20% ethanol solution be mixed with 40% ethanol solution to obtain a 28% ethanol solution?
3 ∶ 2
By alligation on ethanol concentrations:
\[\text{Ratio of 20\% to 40\%}=\dfrac{40-28}{28-20}=\dfrac{12}{8}=\dfrac{3}{2}\]
Therefore the solutions must be mixed in the ratio 3 : 2.
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