Answer :

[tex] \frac{1}{5} [/tex] : [tex] \frac{1}{2} [/tex]

= [tex] \frac{1}{5} [/tex] ÷ [tex] \frac{1}{2} [/tex]

= [tex] \frac{1}{5} [/tex] × [tex] \frac{2}{1} [/tex]

= [tex] \frac{2}{5} [/tex]

= 2 : 5

Hence, the answer is 2 : 5