Answer :

First you need to  convert the given percentage into fraction by dividing it by 100 and removing percentage symbol (%).
Then you reduce the fraction into simplest forms.
Finally you write the 
 fraction turned simplest form to a ratio by writing 
the numerator first,then the denominator.
Example:50%=[tex] \frac{50}{100} [/tex][tex]= \frac{1}{2} [/tex].

=1:2