In what ratio should 20% ethanol solution be mixed with 40% ethanol solution to obtain a 28% ethanol solution?
$$0.2x+0.4y=0.28\left(x+y\right)$$
or, $$0.08x=0.12y$$
or, $$\frac{x}{y}=\frac{12}{8}=\frac{3}{2}\ .$$
C is correct choice.
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