Fraction of Red Marbles

Alice has a collection of marbles in three different colors: red, blue, and green. The number of red marbles is represented as a fraction of the total number of marbles. Specifically, she has 12 red marbles, while the total number of marbles is 30. What fraction of Alice's marbles are red?

To find the fraction of red marbles, use the formula:

$Fraction = \frac{Number of Red Marbles}{Total Number of Marbles}$