Answer
$\frac{c}{4}$
Work Step by Step
We simplify the fraction $\frac{3ac}{12a}$ by dividing by $\frac{3a}{3a}$:
$\frac{3ac\div3a}{12a\div3a}=\frac{c}{4}$
The fraction $\frac{c}{4}$ is in simplest form because the only common factor of the numerator and the denominator is $1$.
