First, write the ratio as a fraction:
[tex]\frac{0.2}{0.3}[/tex]Multiply both numerator and denominator by 10:
[tex]\frac{0.2}{0.3}=\frac{0.2\cdot10}{0.3\cdot10}=\frac{2}{3}[/tex]Since both 2 and 3 are whole numbers and they don't have common factors, that's the ratio in its lowest terms.
Therefore, the answer is:
[tex]\frac{2}{3}[/tex]