we have the ratio
[tex]\frac{12}{27}[/tex]
we know that
the basic ratio is the ratio in simplest form
so
Divide by [tex]3[/tex] both numerator and denominator
[tex]\frac{(12/3)}{(27/3)}[/tex]
[tex]\frac{4}{9}[/tex]
therefore
the answer is
The basic ratio is [tex]\frac{4}{9}[/tex]
