To simplify a ratio:
[tex]a\colon b=\frac{a}{b}=a\text{ to b}[/tex]Then:
36 to 9 = 4/1 [tex]\frac{36}{9}=\frac{4}{1}[/tex]14 : 6 = 7/3[tex]\frac{14}{6}=\frac{7}{3}[/tex]12 : 15 = 4/5[tex]\frac{12}{15}=\frac{4}{5}[/tex]8 : 4/5 = 10/1[tex]\frac{8}{\frac{4}{5}}=\frac{8\cdot5}{4}=\frac{40}{4}=\frac{10}{1}[/tex]