Given:
[tex]\#5.50k\text{ : \#7.20k}[/tex][tex]\text{Ratio in the simplest form=}\frac{\#5.50k}{\#7.20k}[/tex][tex]\text{Ratio in the simplest form=}\frac{550}{720}[/tex][tex]\text{Ratio in the simplest form=}\frac{55}{72}[/tex][tex]\text{Ratio in the simplest form=}55\colon72[/tex]