[tex]the \:simpliest\:form\:of\:the\:of\:ratio\:is\: \boxed{\:5\::\:7\: }[/tex]
[tex]3.5:2.5 = \frac{25}{10} \cdot \frac{35}{10} = \frac{25 \cdot 10}{10} :\frac{35 \cdot 10}{10} \Rightarrow 25 : 35 = \frac{25}{5} :\frac{35}{5} \Rightarrow 5 : 7[/tex]
[tex]I \:hope\:that\:I\:helped\:you\:!\:[/tex]
