The basic ratio of 12:27 is 4:9. You just divide both numbers by 3.
we have the ratio
\(\frac{12}{27}\)
we know that
the basic ratio is the ratio in simplest form
so
Divide by \(3\) both numerator and denominator
\(\frac{(12/3)}{(27/3)}\)
\(\frac{4}{9}\)
therefore
the answer is
The basic ratio is \(\frac{4}{9}\)
