Answer :
To write the ratio using fraction notation just divide the first number over the second and if possible, simplify. So you have
[tex]30\text{ to 45 }\Rightarrow\frac{30}{45}[/tex]Now, simplify
[tex]\frac{30}{45}=\frac{15\cdot2}{15\cdot3}=\frac{2}{3}[/tex]Therefore, the given ratio as a ratio of whole numbers using fractional notation will be
[tex]\frac{2}{3}[/tex]