4 red marbles.
8 blue marbles.
Now lets add these two to find out the total.
4 + 8 = 12
So, 12 marbles in total.
4 red marbles so our fraction would look like this:-
[tex] \frac{4}{12} [/tex]
Lets simplify:-
[tex] \frac{4/4}{8/4} = \frac{1}{4} [/tex]
So, our answer in simplest form is:- [tex] \frac{1}{4} [/tex].
Hope i helped ya!!