Respuesta :

First, multiply both sides by 10:

[tex]2.8\colon6.4\rightarrow28\colon64[/tex]

And divide both sides by 4:

[tex]28\colon64\rightarrow\frac{28}{4}\colon\frac{64}{4}\rightarrow7\colon16[/tex]

This way, the simplified ratio is:

[tex]7\colon16[/tex]